"Yes to almost all of this, except the most ridiculous one — the battery powered clamp. That thing is brilliant (though I don't actually trust it to work well). Clamping can often be a 3-4 hand job. With one hand, hold the object you're clamping firmly in place. With your other hand put your clamp in place. With your free [third] hand, tighten the clamp making sure you nothing moves even a little bit. "