If it was only you, apply the AED immediately since it's a witnesses arrest. If there is someone with you, have them perform compressions until the pads are on, then analyze.
Can you? Sure why not. I never have. The ER has those fancy medical grade shavers that would work well but we don't carry anything other than a crappy disposable razor.
http://www.microflex.com/~/media/Files/Literature/Domestic%20Spec%20Sheets/DOM_SpecSheet_SuprenoSE.ashx
These are by far the best gloves I've ever used. A bit thicker than your normal exam glove but that's why I like em.
Ummmmmmm yes. Tigger is correct. Maybe not as drastic as minutes, but still pertinent. All this spo2 stuff you're talking about Mariemt is honestly BS. Capnography is far more applicable clinically, than Spo2 for arrests.
Emcrit on it: http://emcrit.org/podcasts/oxygen-physiology/