It is sometimes beneficial to put a small metal object down the hole first for the bolt to press against (like the cut-off end end of a slightly smaller bolt). Only a small benefit, but it does stop the end of the main bolt being rotated directly against the wood and causing wear. Not a major issue with a decent body wood, but some of the kit bodies use very soft woods, and you need all the help you can to stop the bolt simply screwing itself into the body wood if the bushing is in really tight.
The best way is to buy a bushing puller, which won't damage the finish or the wood at the bottom of the hole. They aren't too expensive, and their worth goes up the more valuable the guitar you're working on. And the more guitars you have/make, then it's a good investment IMO. The bolt method is fine for a one-off, but if the body wood is soft and the bushing is in really tight, you may need an alternative method.
I have one of these, which I think is/was the StewMac unit (though they've now updated the look of theirs slightly). Though you may find similar units for less elsewhere. Search for both 'Schatten guitar knob and bushing puller' and 'Elmer guitar knob and bushing puller'.
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