What information do you need and what gen?
As to G4s
It think most people use an exacto knife or other small very sharp blade to cut out the hair for custom sculpting mods. I personally use a small jewelry size wire cutters. Then I sand it down and sculpt. It's easier if the pony has been boiled or otherwise heated a bit to make the plastic softer.
Paint wise normal acrylics (I usually water them down. Lots of thin coats, let dry completely before adding new coat) and sealant like for any other custom (I recommend a brush on rather than a spray application so you have more control and you can get a thin even coating). 100% Acetone to remove symbols and eyes.
They don't take dye well, similar to the larger G4s. Well they take it very unevenly and often have a void around the seams no matter how many times you clean them.
Few of mine...
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