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As I'm not at all mechanically minded I feel totally unconfident in my ability to take apart the whole instrument and get it all back together again. I have a vision of myself with an oboe and just one or two little screws left over!
I don't consider myself mechanically minded at all, but I am very methodical and cautious. That's why the first time, I kept such detailed records of what I did. If you have a diagram (digi photo in my case) and mark clearly which key you're taking off, then there's no problem. Never force anything, store each key and screw together, and arrange them in reverse order, so you know which ones go back on first.
To be honest, a decent clarinet or oboe is pretty solid and the worst thing that can happen is having to take the pieces, red faced, to your music shop.
I started becoming interested in them only by accident. I had a student Hanson clarinet and wanted something better, so I bought another one from Ebay. My very first purchase from Ebay.... and also my worst! It was a horrible old Selmer Student Console that needed work doing to it. So I corresponded via email with a guy from the woodwing.org forum and started doing it myself.
Fast forward four years and more clarinets and a few oboes. I just finished repairing a clarinet for a friend's son, but it's only a hobby. I just gave it a good clean, oiled the bore, changed four pads, oiled the keywork and adjusted the linkage. The only things I don't like doing are changing springs. I've done this on clarinets, but never on an oboe. Some things are best left to the professionals!
Don't forget the screw adjustment on oboes. I use a small DIY book by Carl Sawicki, but there's one by McFarland... think. Worth its weight in gold!
Steve