Hunter - unlearning talentsFollow

Something I don't understand - help would be appreciated.

My L73 blood Elf is currently double spec'ed (Marksmanship and survival) The first is fine, the second I'd be happier without.. I understand a hunter trainer can help me unlearn for a price - no sweat - I'm flush. What I don't get are:

1) can I just unlearn one set, or do I lose everything?

2) If I do so, then re-spec to beast mastery. Do I do so with all the talent points I've earned and just reassign them, or do I lose points and have to regain them?

3) Am I right in thinking that if I "lose" a set, my pets will keep their points and just have to be reassigned?

How many talent points you have is based on your level, so you can't lose any and only gain them through leveling up. So if you have 50 talent points at the moment (I have no idea how many you would actually have at that level) when you go to the trainer and unlearn your active spec you will have 50 points to spend in your new talent spec.

Your pets keep their points too, but you need to respec them as well.

If you've used any glyphs they will stay in place, if you want to change glyphs you need to buy the dust stuff to replace them.

Your pet has a separate talent tree for each of your specs as well.