I can only speak re 205 & 405 blowers, but they are under the glove compartment. Firstly, when it does not blow try moving the wires to the blower (it's about 6-8" dia), it may just be a dodgy connection.
If it needs to be removed, there are probably 3 screws to be seen - remove these & it will drop out. You will need to get on your knees and look up the footwell.
Blowers do wear out.
Steve
February 2008