Tips for operating manual levelling jack with painful hands?

Another suggestion if you had an air compressor.. is a air driven hydraulic jack.. They are the cats meow ..

HERE

Alternately you could check out small "floor" jacks (these are the ones that have the long handle), they do make some small compact sizes but may be a bit hard to place unless you are on pavement..

I have a large 2.5 ton floor jack which is nice when you don't wish to crawl under something to get a jack under.. But it is big and heavy, the smaller ones should be more manageable.