Like others, I steam or boil the tips, then clamp. Leave clamped for a bit, then dry heat temper the belly side of the bend pretty good with a heat gun. This helps keep the curve from pulling out in yew.
All of this goes much better if you have your limb tips down to a reasonable amount before attempting the bend. Trying to bend too much wood is where I got into trouble early on, and I see a lot of others make that same mistake.