I waited many years to fulfill my dream of being an excavator operator. Encouragingly, there are many operators, and they all got there somehow, its amazingly fun and if wanted, you should pursue it no matter how long it takes (ask them how they got there). If you can't afford to rent or buy your own, then you probably need to find employment that will lead to equipment operation (contractor, municipal or utility, or maybe military enlistment), or befriend someone who owns equipment. I rented my first experience with a backhoe. Operating it was not a thing of beauty, and I did smash a tree I would rather have not damaged, but it was on my own property. After that, in my position as an electrical contractor, I found some opportunities to run backhoes for friends and clients who (perhaps foolishly) trusted me. Instead of joy sticks, the backhoes had individual controls, which I estimate takes at least 300 operating hours to start getting the hang of. I once heard that if you want to learn to operate, spend a few hours at the controls, then spend all the time you can afford watching professional operators. That advice has served me well. At about 55 y.o. I sold my city house, bought 60 acres in rural Idaho, and a bunch of used "yellow iron" from the "Nickel's Worth" classifieds (Excavator, Backhoe, Dozer, MotorGrader, Dump Truck, trailer). My objective was to become proficient on multiple units. Even being reasonably proficient on the backhoe, switching to the joy stick controls of the excavator took about 2 weeks of continual use before I stopped smashing my spine every time I accidentally lifted the tracks and too quickly dropped them back down. You might compare it to switching from being a proficient typist on a standard "qwerty" computer keyboard to one with some other arrangement. It probably took a year of operation before I could put the bucket where I wanted it, lift a load, and load a truck, by just "willing" it to happen, as you would when you picked up a glass of water with your hand, rather than having to "think out" each move. Learning reflex operation is part of your every day life when you are 2 years old but can be rather frustrating during your mid-life crisis. Passion and patience make it happen. All that said, if someone wanted to use my equipment for learning, the most I would let them do is either dig a hole in a large open space, or fill a truck from a pile of dirt. However you can't learn more sophisticated activities unless you can control the machine's basics. Eventually you have to master multiple movements of the arm and bucket, like when digging the bottom of a level trench. I practiced by moving the bucket in and out while keeping it level just above the ground, eventually advancing to motions like smoothly moving the bucket from ground to top of truck. On my own property I learned to dig holes and load a truck, dig stumps, carve (pioneer) a road along a hillside, load logs and "throw rocks" using the "thumb," use the hoe to unstick myself, remount a track that fell off, replace hydraulic hoses, pull down trees, level and grade using the boom and bucket for finish grading or carving a level pad for further safe operation of the machine (instead of a 6-way dozer which is often the better choice). I can envision using a computer simulation program to coordinate visual input of a boom and bucket with hand operation of joy sticks, yet you eventually have to include your body's feel of the machine. Another point is that the individual cylinders operate with different rates and forces which change as you combine the boom, dipper and bucket in different ratios. After all that, to operate independently, you need to understand the physics and dynamics of all the sites and situations where you might work. I've applied my understanding of "vector math," meaning that every force not only has magnitude but direction as well, to predict the results of my application of the bucket to any task. I agree with many of the other previous suggestions of the things needed to learn. But if you have the passion, its all fun and worth the investment of time. If you have some equipment experience and construction savvy, your money might be better spent renting equipment for seat time rather than taking a course, however this also requires some "place" to operate. A relatively cheap mini-excavator rental (the size they will use at a school) will serve just as well to learn the reflex operation of the controls (and uses less fuel). I've often thought a quarry might be amenable to learning time, although everyone is wary of legal liability. My last advice is to remember that hydraulic hoses can leak slowly or burst (I've had both happen), trapping or crushing you - NEVER allow yourself to work under something held up only by hydraulics, from car jacks to excavator booms. At 66, I now solicit tractor work and can't foresee when I will quit. It was definitely worth the wait, and I only wish I would have pursued equipment operation at a much younger age.