Bill; I am with Mike. I think you can do this with maybe a little help. The first thing I would do is take a heat gun to it to warm it up and see if you can free it up that way. That generally works for me. I have worked on a few for the R/C guys at our club, and there are only a few things that are very difficult. Removing the valve keepers and keeping them from flying away is one thing. If you have worked on a 2 stroke, the only thing added is the valve train. Once you get the intake and exhaust pipes off, you can look at the valves to see if they are carboned up bad. If not, you may not have to do anything with them, unless you have a compression problem. They can be cleaned up and reseated if they are leaking.
Most of the ones I have worked on just needed cleaned up, oiled, and put back together with new bearings. Saito's are reasonably easy to work on, and I have yet to see one that needed a new ring, and most times you can even reuse the gaskets. I did have one that had a bad pushrod from the factory. I had to make one from music wire as Horizon was out of them at the time. That was on my own 56, and it has been running for a long time now with the homemade pushrod.
So, between Mike and I, we can help you do this. If you run into to much trouble, you can send it to me, and I will do it for you.