Product review (5 stars): Took about an hour, but the dryer is no longer screaming and squealing  like tortured soul. Helps to have 2 people to fix it.
If your dryer is  squealing and squeaking you need this kit.  Mine sounded like mini demons from hell were screaming to get out.  This kit has my dryer quiet again.
Not sure how some people have managed to replace all the parts (wheels, tensioner and belt) in ten minutes, it took my husband and I about an hour and we are pretty handy.  If we had to do it again it would probably take about half that time.  It helps a lot to have two people, because it is physically hard to hold up the drum and get the belt on it at the same time.
To figure out how to take your dryer apart check online videos.
The instructions are so- so.  Here are some things we learned.
The wheel that is on a support is much easier to get off if you removed the heat shield over the gas heater (at least on our Maytag dryer) to  access the screw for the support and so you can pull the wheel off.  There is a toothed locking washer on the support that needs to be pried off before you can get to the triangular plastic holder and then remove the wheel.  Rotating the wheel as you remove it makes it easier, but it takes some force.  To put back on the new toothed washer (included), use a socket to push on it.

Check for hair and gunk wrapped around the wheel axles.

When putting the tensioner and belt back on, have one person hold up the drum.  It will seem like there is not enough slack to get the belt through the tensioner and around the motor.  By pushing the tensioner wheel toward the motor you will be able to slip it on.  It should not be a huge struggle, if it is, you are not doing it correctly.

Make sure to follow the last step once you have everything on to get the gasket on the back to not be folded into the drum.
The belt is a little narrower than the one that came originally on the dryer, but so far it seems to work fine.