^This or don't pull at all and just suck wheel until you are strong enough to be part of the rotation. Be careful not to drop your speed too much when dropping back or you'll need to accelerate harder to get on the back -- every acceleration you have to make early will leave less in the bank for later in the ride. I've found that when my front wheel/hub is around the BB of the last rider is a good time to start gently getting over and then I'm in the draft pretty quickly without being gapped. Remember to have fun and keep on showing up!