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Check out some carpentry articles about boring holes. Those should have more detailed instructions on how to do it (namely a progression of a guide first, and using that as a basis for the larger, main hole). And finally, it's also all practice.

Eyeball location -> lightly poke with fine-tipped awl/thumbtack -> check alignment -> poke harder at final location -> enlarge by twisting tip of X-acto blade -> drill (-> swap bits and enlarge hole, if necessary) (-> swap to larger bit and debur/chamfer edge, on larger holes).

Sounds like a lot of steps, but if all goes well, it takes well under a minute per gun. Process is exactly the same on plastic or metal, just takes a bit more effort to drill in the latter case.

One thing I've found works better for me is to keep the pin vice stationary (excluding rotation, of course) and push the gun into the bit. Keeps the bit angle consistent, so I can control the direction of gun travel and thereby the barrel alignment a bit better, just by feel. Gives me acceptable results for the effort and requires absolutely no specialized equipment.

I just use the tip of my modeling scalpel. It just takes practice dude

Had a great time drilling last night... got through a bunch of bolters on bikes... also did a bunch of MM and meltagun bores... just having trouble with the metal meltaguns... I'm also boring exhausts.

Some examples of my drilling.












Having trouble with the metal parts.