Product review (5 stars): A good DIY project if  you have the strength
I finally figured out that the squealing noise that was increasing in duration as my Frigidaire Affinity tumbled laundry was coming from the belt.  I ordered this belt after looking online for the procedure of how to change it, which seemed pretty straight-forward.

The new belt stopped the squealing noise.  An added bonus was that I noticed the final spin speed has also increased; consequently the laundry is drier at the end of the cycle.  I later put 2 and 2 together that it was not my imagination that the machine was spinning slightly slower than I had remembered when it was new.  Seems the machine was lowering the spin speed due to the slipping belt.  The machine is back to working like when it was new.

Once the machine is pulled away from the wall to expose the back, removing the back panel is a breeze.  Removing the old, stretched belt was quick.  Putting the new belt on required some effort to thread over the drum pulley.  It took about 5-10 minutes to change the belt once the rear panel was removed.

If you have the strength to move the washer and to thread the new belt over the pulley, this is a good DIY project.  I will do this all over again in 5 or 6 years when this belt shows signs of wear, assuming it lasts as long as the original.