I've done exactly what Jerry has said and what your planning on a couple of old tractors,it can be done.........but,before your half way done, you'll wish you had pulled the engine and may very well stop and pull it to finish the job..
by the time your finished, you will need back surgery and 2 new knees!!!!!
You have no idea how many times you'll be on the floor crawling under the car and how many times when you finally get into a position to do something, you'll realize you forgot a tool and have to crawl back out and get it....I hope your young and have a good back and knees....
David