When I installed my F4i forks, i just used 2 alligator jacks. I put one on the right side, at the front of the engine next to the header there's a tab that sticks down, I put the jack right against it. I put the other jack on the left side on the same point (mirror image) and jacked that one, didn't touch the other one. When it was level, I worked on it.
When I replaced the axle, I put a jackstand on the right side and jack on the left. The jackstand went on a different place pretty close to the point where I had the jack, can't remember off hand though.
If you do it this way, be careful as it's not completely stable. Have somebody with you and it would probably be a good idea to strap it down.
03 919 (most of it anyway)