For dealing with small delicate screws like you have requested help on:
I use a Facom AEFP.00x35 daily for work. It is plastic handled screwdriver in a watchmakers style.
[link text][1]
[Facom AEFP.00X35][1]
I also use a Bergeon watchmakers screwdriver at home on my own small screws (watches, AV kit) but they are really expensive for a one-off or low use tool.[link text][2]
tool.[Bergeon watchmakers][2]
[1]: http://www.facomtools.com.cn/pro/ScrewdriversforPhillipsandPozidrivheadsen.htm
[2]: https://shop.bergeon.ch/Catalogue/PDF/N-8000%20G%20H.pdf