My wife gave me her battery operated nail polishing / manicure tool - works perfectly for sanding & polishing at low speeds - very cheap option!
Otherwise for drilling purchase a lightweight low spec cordless screwdriver - have never used a pin vies since
WiP
1/24 Hawker Hurricane Mk I
1/48 F-22 Raptor; F-22 Idolmaster, DH Vampire, Saab Gripen
1/72 C-130 Hercules; Vulcan
1/350 Bismarck