I agree with Billrog, DIY does not always result in a huge savings.
I had a dealer do the first service. I forget how much they charged but I think it was under $400 but not by much. And they came to my place which is about 35 miles from the local dealer. That service did, however, also included a fuel filter change and included greasing all zerks on tractor and FEL, and they took away all the used oils. And I was there so got to ask a lot of questions.
Anyway, I recently serviced everything myself and with the cost of the hydraulic oil (for transmission and front axle) and engine oil, and two hydraulic filters, an oil filter, and both air filters, it came to about $360 in supplies alone, not including the radiator flush and antifreeze or grease. For my tractor, those things are not cheap. And of course, I made a bit of a mess with the grease gun, there was some frustration at times, and then I had to take all that used oil to a recycling center.
I was glad I did it myself as that way I become more and more familiar with the tractor and always learn something, and it gets easier each time. But if I did not want to do it, I would think $450 would not have been unfair to charge for all that I did - and remember, they came to me so I avoided taking the tractor all the way to town.