Before I had a center stand, I used a motorcycle jack under the engine with tie downs, and I think I put a 2x6 across the jack with an extra 2x4 under the front of the sump to level it out. I also raised it as high as it could go, and used more tie downs in the rafters of my garage as a "just in case".
If you have the standard rear fender, you may have to let out all of the air from the tire for clearance. It's still a PITA.
Sometimes it's easier to do one tire at a time instead of both at once if you don't have the center jack. I have a local independent dealer in town that only charges $20 more per tire if I bring the bike in, and they let me test ride their bikes all day until the work is done. You may want to call around.
Ken