(
here is an (modified) older post of mine regarding tire changing from this thread: http://forums.sohc4.net/index.php?topic=36069.msg372096#msg372096 )
I found that the right tire tools were everything. I would NEVER even THINK about using a screwdriver, however, as I tried that (before I got a tool set) and promptly put a hole in the tube, despite being
beyond careful.
I used this set of tools that can be gotten off of feeBay for like $30. The spoons are flat and really broad (unlike a screwdriver) and though I slacked and didn't put duct tape on the rim or anything (like a lot of peeps recommend to protect it) the chrome was fine.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&viewitem=&item=330243126521It was the bottom tool that was the best - I ended up buying another one of those, actually, as you can really get a lot of leverage with it. The middle tool is nice for moving the bead over the rim.
Also, some form of lubricant on the rim and tire REALLY helps immeasurably. I just used a bit of Simple Green in a spray bottle - worked great but I have heard others using silicone, grease, etc. (I was worried that the latter would be too persistent and maybe the tire would slip on the rim - possibly shearing the stem?) I checked said rim/tire over a year later and there wasn't any residual water inside or rust from the spraying, either.
I also found a rubber mallet is perfect for getting that last 6" or so over the bead (THE hardest part of all of this, to do - see next post (what jogged my memory)). I got one at Wal-mart for like $1.99. While trying to lever that last bit over, a few whacks with the mallet kinda sideways on the bead made it WAY easier!!!