Don't let them scare you. I did a TT a few years ago - it was a mess. I have around 400 hours into the rebuild, 395 of them we were just a blast. There really isn't anything too complicated about it, just time consuming.
As far as the costs go, shop around and you'll be fine. We bought a bunch of stuff off ebay, the carpets were remnants from Lowes and/or Home Depot, even my local RV dealer helped me out.
I kept track of every dime I put into the repair, this one was $2,611.33. That even includes the new tires and $400 I have listed as "miscellaneous", just in case I missed something.
Would I do it again? Probably. :B
Camper Rehab