thats just parts cost mate.
There isn't really all that much to an exhaust. granted, it would be an easier job with two people, but tools wise and technical ability wise, it, (cross fingers), shouldn't be a difficult job. Time consuming, yes. Difficult, no.
4x high axle stands.
Rubber or soft faced mallet.
Lots of Plus-Gas / penitrating fluid.
A breaker bar, ratchet and a selection of sockets, (including deep) in the sizes(s) needed for the nuts / bolts.
I reckon it would be possible to do the job over a weekend? So the question is, would you want to and save yourself a couple of hundred quid? Don't forget to factor in the cost of any new gaskets, rubbers, mounts and exhaust paste.