You're gonna love your TA22 when she's on the road. I've been doing the same on my 23, but it has taken me longer than planned. It original was going to be a rust repair and quick respray over the existing paint... well that turned into a full blown bare metal job and I've only just now gotten around to getting her ready for the top coat, only been about 9 months in the making.
I spend so much time sanding the car and trying to make sure each part is perfect, no imperfections in the undercoat or anything, and I know it will pay off. I've learnt heaps too, been a lot better experience than simply buying someone elses restored celica. It will be your baby and no one elses!