I am looking for some advice on how to attempt my own instrument repair. I understand this is a touchy subject as it really is best to have your instruments repaired by a knowledgeable brass tech (trust me, I have seen some pretty awfully botched trumpets in my school band) but I would like to look at doing some minor repairs to a few of my cornets. Particularly I will be purchasing tomorrow what I understand to be a 1927 Conn 22B Symphony Cornet and a 1915 York (Grand Rapids Co.) Cornet for a grand total of $50. I know that the Conn has a dent in the 2nd valve slide and an opera style tuner that will likely be difficult to budge (as stated by seller). I believe the York has a slight compression issue with the third valve and needs a good cleaning, which I trust myself to do with a fair amount of dawn degreasing soap and some lukewarm water. Aside from this, I'm wondering what sort of tools might be useful for attempting to straighten slides and leadpipes, and doing some of the repair work. Aside from the Conn, (and not by much), none of these cornets I seek to repair are very valuable or have any sentimental value. I'd like to learn some basic repair tips- and am looking for recommendations on the right tools and a place to start.