Slowly and surely is how I have to work these days . I used to have a nifty wooden box that snugly fitted a Chevy i6 engine (I'll leave it to you do guess which series) , the bottom of it was about 4" wider that the sides so it could be used to support and test run old engines.... The main thing is to cobble up a lest enough radiator hoses so the engine water jacket is always full before starting it up . Remember : this is a fun job , very rewarding once you get it done . do not approach it like a chore else you'll never be happy with it .