With a Glock, you really don't need a gunsmith to do the work. Glockmeister has disassembly instructions on their website.
To improve the trigger requires a little polishing with a Dremel tool with a felt wheel installed and nonagressive metal polish such as jewelers rouge, Flitz, or Simichrome.
You polish the trigger bar, connector, and firing pin safety plunger surfaces to a mirror finish. You will need to disassemble the pistol and slide. Instructions are on the Glockmeister website.
A 3.5 pound connector and competition trigger spring will make a world of difference. The spring you can find at Glockmeister, but the connector is available from them or Lone Wolf Distributing. The best deal on connectors is the Scherer brand and you can pick those up for less.
For lubrication you need to use something like Neco Molyslide on the hump area of the trigger bar and where the trigger bar and connector surfaces engage. Also make sure you apply to the firing pin safety plunger as well. Oil won't hold up and will give unsatisfactory results.
Personally, I wouldn't spend the money on the Glockmeister dropin trigger. For $17 or so and 15 minutes with a Dremel tool you can do the same thing. If you don't have a Dremel tool you can get a cheap one at Walmart for around $30 and Flitz will cost around $7. Still a good deal and you will have the Dremel tool to do a lot of other things with too.
The beauty of the Glock - it is so simple that even the village idiot can work on it.
[This message has been edited by slickpuppy (edited March 30, 2000).]