Parts are the cheapest thing on a garage bill, I had a car where the lower wishbone arms needed replacing, was quoted £600 to fix (nearly 18 years ago). I got the parts for £55 and fitted them myself with the help of my father in law.
Took 4 hours for the 1st side and 40 mins for the 2nd.
Just make sure you got somewhere warm, dry and secure to do the work, in case it takes longer than you thought.
Last set of discs I replaced were a pain to get off, see if you can get hold of a "puller" as described here
although I might be telling you something you already know, for which I apologies