If you're gonna do this, don't let the carb intimidate you.
If you don't take off parts that shouldn't be taken off, you'll be fine.
I have one favor to ask. Since you are already torn down, would you mind measuring the inlet diameter and total circumferance of the carb intake? I haven't gotten there and probably won't for some time.
You're watching part number 20 in this pic.
Here is a link that I used a looooooong time ago.
http://771doug.netfirms.com/float.html
If you don't feel confident with this procedure or with the help of the service manual, I'd suggest takin' it in.
Needless to say, carbs are pretty important in the function of the bike. You don't want to screw something up.