backstab question

I have been playing around a bit with an experimental character. A half-orc Berserker who dualed over to thief at level 7. I put 3 pips in weapon skill with bastard sword and long sword, for an APR of 2 with each. I haven't hit level 8 thief yet so I can't test it out on my own, but I do have some questions.
1) If I am hidden, and decide to go berserk before attempting the backstab, will that action take me out of hiding?
2) Since I will be getting 2 weapon attacks, do I get 2 backstabs, or does the first one take me out of hiding? If it does prevent a second backstab, will I still get a second (normal) attack from the open on the same round?
3) I can't slip into hiding wearing plate mail, so I have some studded leather for those occasions. But what would happen if I hid first, and then put on plate mail? Would I drop out of hiding? If not, would I still be able to backstab?
1) If I am hidden, and decide to go berserk before attempting the backstab, will that action take me out of hiding?
2) Since I will be getting 2 weapon attacks, do I get 2 backstabs, or does the first one take me out of hiding? If it does prevent a second backstab, will I still get a second (normal) attack from the open on the same round?
3) I can't slip into hiding wearing plate mail, so I have some studded leather for those occasions. But what would happen if I hid first, and then put on plate mail? Would I drop out of hiding? If not, would I still be able to backstab?
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Comments
Only one backstab per reveal. The first attack makes you visible, and after that you're not eligible for a backstab.
Putting on heavy armor ends your stealth mode. It does not make you instantly visible. And you can't do it during combat - if either you or the enemy has started moving to attack, it's too late.
Worth to note:
Not all weapons can backstab.
Only melee weapontypes originally available to thieves can backstab - that's the easiest way to determine.
Since bastardswords are not available to thieves, they can not be used to backstab - even if you are now actually able to use it because of dual classing.
At least this is what memory tells me.