RE: tool for starting/holding tiny screw heads?
The magnet works on ferious, non stainless screws. For others, you can use a sticky wax, the kind used for braces. Other things I've used is rubber cement, just a small dab on the end of the screw driver will usually hold the screw long enough to get it started. These work with socket heads also.
The down side though is that youmay have some wax or rubber cement to clean up when finished.
If you can, and it's a big if sometimes, position the piece being screwed so you are screwing in the screw from under it. Gravity will hold the screw on a screwdriver that fits the screw. One other thing I've used is to use a jewelers tweezers and carefully put the screw into the hole, then carefully using the screwdriver for final alignment and screwing. This only works from above.
Cursing will sometimes help in that it lets off enough steam to prevent one from picking up a hammer and "nailing" the screw.
Don