Regardless of your method, do it carefully. I was able to slip the engine out of my GR650 by myself without laying the bike down, but i payed for it for the rest of the weekend and I've been called a "monster" by people I work with because i swap transmissions without a jack (but they're only Mazdas, I don't see the problem...). I wouldn't do that on my CB750.
Your best bet is to find a manual, watch some YouTube, read as many build threads here as possible (Jimbonaut just walked us through an engine removal on his CB750) pick up a box of beer and grab an assistant.