fitting is pretty easy mate although it could become more fiddley just using axle stands,the problem you've got is getting the original system off as its a one piece exhaust,most people cut it around the rear axle area then use a sleeve to refit it if they are selling up but i wanted to keep mine in one piece which meant dropping the rear axle
personally i think its worth paying a performance garage to fit it then they can put it on a ramp and get it properly aligned,a fair few people on here have had issues with getting tailpipes on the ktec system to stay in the centre of the diffuser outlets,mine was like this but after a few adjustments all is well now...(be careful as well as some people have actually melted the diffuser with the exhaust tips when poorly aligned)
after fitting take the car for a 5 minute blast then check the centralisation of the tailpipes as this is when they will move,if they've moved then let the exhaust cool and adjust it,this is why i say let a decent performance garage do it as they will have to pi55 around putting it right for you,happy motoring!