1. Eject! :)
Seriously, I found the river bunker mission very useful for learning to defeat SAMs. For example there is a group of SA-11s at 10oc from where you start. I like playing cat and mouse with these. One trick I learned is to fly around the edge of the engagement envelope of the SAM, trick it into firing then run away. They always fall short, keep doing this till they run out of missiles. I also found that if you get caught out and you can't run intime, vertical changes followed bt a hard turn into the beam works well. Its the one that I don't see or the two coming at me from different directions that always kill me!