Heated seat kit advice please.

Hello, looking at the britpart heated seat kit to treat the freelander, I was wondering if anyone had fitted one before and if there is anything to be aware of, the wiring I can handle but I'm just a bit nervous at taking my seats to bits, the freelander is 2002 td4 with the cloth seats. Also I had the britpart seat covers fitted (can highly recommend) will this be an issue?
Many thanks Edward.