Good for you man, that's the right attitude!!
I rebuilt my T45, it was absolutely the most frustrating thing I've ever done, but I got it done and it works great.
There's no way in hell I could have done it without help from Zak at the T45sourse, but he's not around anymore. I couldn't find his web site, looks like someone bought him out?
During the process of my rebuild, I asked him about a TR3650 rebuild kit, he said that the TR3650 was a lot easier to rebuild than the T45. He said that the bearings in a 3650 are not pressed in, so it'll be lot easier to take it apart.
Main thing to do is to keep everything in order it came out. Take a million pictures, don't take anything for granted as to how it goes back together, pay attention to ever little detail. This will make reassembly much easier.
Sorry, but I can't be any help in the rebuild itself, but if you feel you're up to it, than do it.
Here's a pic of how I kept things in order.