I've only had to change one fuse, once, in my 8ks in 16 years. A pack of eight fuses cost around £4 at a local electronics parts store. No need to worry.

If you are doing a lot of configuring (ie playing around with multiple different configurations for fun) rather than just setting up for the task at hand, you are more likely to blow a fuse by repeated fast on/off/on actions of the main power switch.

Cheers

George