Tight Tires

The other thing I find helpful it the proper swear words, now you may need to come up with your own as I can't share mine on TE :)

I second the fact that some tires and rims are just really tight and sometimes you have to use the tool to get it on.

Here's another tip. Once you get the tire mounted almost all the way, check to make sure the tube is not being pinched and then go all the way around the tire pushing the bottom of the tire in towards the rim; this is kind of hard to describe. But, if you do this, it helps get a tight tire on.

As an aside, I'd rather the tires be a bit tight than far too easy to get on. They have a better chance of staying on the rims that way. (You don't have to ask how I know this. The new tires were harder to get on, and are staying put.)