Quoted:
If you are turning left right and they pull up on your right left, you go when they go.
Nobody can hit you because they are in the way covering you.
That solves half your problem.
ETA:
What can I tell you .......... I am left handed and always get it all fucked up.
Sorry.
Still, not necessarily. What if the left turner (who has been sitting there for a few minutes and is getting impatient) decides to pull out for a left turn but has just enough room to clear traffic that is approaching at a high rate of speed? He would be safe. You, the right turner, unable to see this, decide it is clear because the guy next to you pulled out. Wham, you get rear ended because you were unable to accelerate in time.
Definitely one of those cases where its not safe to assume its clear.