Walter, should you want to do your own maintenance, you can do 90% of the maintenance yourself with only 3 tools: Philips screwdriver, Flathead screwdriver, small vicegrips. should you decide to remove or replace the fan, you will also need a small allen wrench or very small screwdriver to insert into the motor shaft to hold it in place while you unscrew the belt pulley.
There are a couple of excellent videos on youtube showing how to disassemble the Kirby vacuum for maintenance.