I've been done and certified for almost a year now, still have to go for the odd course when a new transmission comes out or something, or other new stuff GM comes out with. Personally I didn't find the work load in trade school all that bad. I only had to go once every 8 months or so for 2 months at a time (4 times). All I can say is keep at it and work! It'll be worth it when you're all done.
2000 Chevy Silverado RCSB LS6 5 speed, LS6 short block, 317 heads, LS6 intake, Lunati 220/224 .575/.575 112LSA cam, Edelbrock Headers, CTS-V accessory drive, Nelson Performance Custom Tune.