If I can build a kit, pretty much anyone can.

I never did any kind of modelling or building when I was a kid. I picked this hobby up at 35 or so and in the past 3 years have built about 7 kits. I have found that if you read the manual and follow the directions you will be fine.

My fleet:

GP - 40 Trainer (2) - Don't ask why I had to build a second one.
Sig Mk II - .20 Size Trainer (bought from a guy getting out of the hobby)
GP .40 Piper Cub
GP .40 Corsair
House of Balsa .20 Texan
Unionville Hobby .60 Norseman (about 70% complete right now)
Dynaflight Chipmunk 1/4 Scale (about 90% of construction done - see my thread in Kit Building Dynaflight Chipmunk - Build)

I am now looking to advance to building from plans, maybe from a short kit.

Building does not take much to start, read the instructions, follow them 100% and you will be fine on your first trainer. Then start to advance to more difficult builds, my second was the Piper Cub, then the Corsair. I have moved up to Giant Scale now and am really enjoying the build.

The biggest problem I have with building is finding the time to do it. I tend to work in fits and starts, getting any real traction on a build takes a commitment, and with a wife and two kids it is tough to commit that much time to a hobby.