Teen In The Seduction Scene

When going out I am having some trouble with ways of approaching.

Lots of the really nice sets are moving sets. These are tough. I heard not to open a set moving towards you. Is this true? Is there a way to do this? If so it would widen my scope of people to approach.

Also,

Approaching a set that is moving in the same direction as you. Clarification on how this is done would be great. It's a bit confusing still.

That is all for now.

Thanks in advance for any help! :D