Should be fairly easy if you already have an aftermarket exhaust fitted you should just need a ratchet, some extensions and some sockets if you take 10,12,13,14,16,17mm sockets you should have most of it covered at that.

Start with the 3 bolts from your downpipe

(exhaust side of the engine).

Then undo the 2 bolts to the rear section as most systems are in 2-3 parts then that should sort out your mid/ flexi section.

You might get away with just sliding your current exhaust off your rubber mounts if not un bolt them then take it off the mounts.

(spray the rubber mounts with wd40 or similar it will make things easier to slide off)

HTH