1.
The White Council
The definite members were Saruman, Gandalf, and Galadriel. It is possible that Elrond was also included, and perhaps other important elves, such as Glorfindel. No doubt Radagast may also have been included.
When they met was never specified. It would seem that they met when there was a problem, and it would seem they met quite often when Sauron was in Dol Guldur, as Saruman kept trying to dissuade them from attacking.
It was never written where they met, as far as I know. I can only assume it would have been in either Lorien, Isengard, or Rivendell. Perhaps it varied.
As for what the Council did that drove Sauron out of Mirkwood, that too was never mentioned. However it would seem that they needn't have done much, as Sauron feigned to flee.
Quote:
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…persuaded the Council to attack Dol Guldur first, before he attacked Lorien. We did, and Sauron fled
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Unfinished Tales, The Quest of Erebor
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Yet at last, as his shadow grew, Saruman yielded, and the Council put forth its strength and drove the evil out of Mirkwood
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Fellowship of the Ring, Council of Elrond
It is never specific.
2.
Healing
Can healers heal themselves? I couldn't find any textual evidence, so I'll just give you my view. Do with it as you will.
If a healer was injured, would they be able to heal themselves? It is doubtful whether they would have the strength, or whether they could reach the materials. If it was a minor injury, then I'm sure they could treat it in much the same way as they would to anyone else, but with a major injury, they wouldn't be able to.
As for a healer's strength...I'm unsure. Healers tended to use a lot of herbs etc to heal, it wasn't all their own power.
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I have, maybe, the power to heal her body, and to recall her from the dark valley
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Aragorn about Eowyn, The Houses Of Healing
This would indicate that although Aragorn had a lot of power, there was only so far it would go. So I would assume, that the more people that were healed, and the worse the injury, the less effect it would have. The healer would have to recover their own strength before healing more. This could also apply to them healing themselves of course, they could be too weak/injured to help themselves.
Well, this was an extremely long post, but I hope it helped. All the questions are really open to your own interpretation.
Varda