Most or all the parts you'll need you can find on ebay assuming Mike Holt doesn't have any. But I would recommend just diving into it head first...so to speak....and like Granpa Don said, you may make some mistakes, but you'll work through it and then the next time it won't be nearly as scary.
Sometimes you may put it all back together, and something isn't right, probably a shaft/motor 180 deg off, or ribbon cable not seated properly. I found that even though they may look perfect inserted to the line etc etc......sometimes for some reason they just don't make the connection. The last gimbal I worked on didn't work, didn't do nothing when I powered up. I took off the ribbon cable, checked everything couldn't find anything visibly wrong. But you know what, it worked flawlessly when I powered up again. It had to have been the cable.
Oh yea, be careful when your trying to release the ribbon cable from the boards. those little levers you have to lift up are delicate.
So dive in and just do it ..... just be careful and work methodically and my bet is you'll do just fine.