If they're willing to crawl on you you could start with food bribes. I like cereal puffs (the kind they sell in the baby food section, Gerber Graduates or any other brand). If they won't take it from your hand, then put the food where they can get it (the nice thing about puffs is they're small, so they don't get full fast). Gradually move your hand closer with each puff (so if they want the puff, they *have* to grab it nearer to your hand). It should move to the phase where they'll take food from your hands, which is good because they'll associate 'hand' with 'yummy things come out of it'. For reference (I had a very small hand in it), lilspaz68's Inca was absolutely horrid around other rats and generally around hands - just a poofy irritable 3-legged girl. We worked on the puffs together, and actually got her to take from our hands within one evening. Now she's actually happy being picked up and everything.
If it's more just the contact that they don't like, maybe set them down with a bowl of utterly scrumptious food (yogurt, baby food, Ensure, etc). Then, while they're stuffing their little faces, gently touch their backs or tails (tails first maybe, they never seem quite as off about tails being touched). Don't bother with touching around their faces or heads while they're eating, even my rats who are the most docile in the world don't like me messing with their faces while they're eyeballs-deep in mashed carrots, lol.
Now, if it's prolonged contact with you, the down the shirt trick is wonderful. Wear two shirts (belt them at the waist with a bit of an overlap, so it isn't clinging to your skin), and in go the rats between the layers. Some people will just wear one shirt and have rats contact their skin directly, but that depends on how ticklish you are
They won't like it at first, or at least will be a little thrown by the cozy warm dark, but then the fact that it's cozy, warm and dark sort of seduces them. And our heartbeat - nothing seems to calm animals or humans like the sound/feel of another heartbeat (goes back to hearing one's mother's heart in the womb, I think).
