Hi, Rich, and welcome to WriteWords
170K novel is great going. For tips on editing I found Sol Stein's book 'Solutions For Novelists a great help, and now's also a good time to write the old synopsis, as that'll also show up places in the plot that need tightening, &/or superfluous characters.
If you need any help in navigating the site just give us a shout.
- NaomiM