Great thread, guys!
I agree whole heartedly with the points made here, but I have to say there's a huge psychological factor as well. I'm only 17 but am in progress in a SBC swap in my 79 ZX. I NEVER would have expected that I'd be doing an engine swap now, or ever in my life to be honest. That said, it's been a hard road to where I am now. No one in my family has much automotive experience beyond basic upkeep and I'm working out of a single stall garage that's also storage for my family. I don't have any tools beyond a socket set and wrenches. I don't know how many times someone has asked how much money I have in the car and when I respond $2500-$3000 and still spending, the say "You could have bought a nice car for that much" The one HUGE help I've found is one of the auto-shop teachers at my school. He has a 510 that he's set up for auto-x and rally and knows datsuns pretty well. I guess I'm rambling now but I guess if there's one point I'd like to make, it is this; Take it slow, talk to everyone you can, READ READ READ, plan ahead and when you feel down just walk away for a while and remind your self that it's all worth it in the end.