Been running small dozers on and off for 30 yrs.On Residential jobs. D3, case,John deere. Pretty good operator not the best by no means. Had a job offer the other day to run a D8 for a couple weeks. They will not show me how to run it i am suppose to know how. I turned down the job. I am sure i can run it but for pure embarassment i turned it down. This is on a commercial job site pushing dirt no finish work. My question is how hard or how complicated are the big dozers to operate. Or my experience on small dozers would be enough to let me get right in to it. Good choice or not.