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In my experience, straightening resin is not as straight forward as some would have you believe; different resin chemistries respond to heat in different ways. Yes, often hot water is all that's required to get that tweak out...other times, I have found that steam works better - again, this is very resin dependent.
The "softer" resin type materials tend to respond better to hot water, however some of the urethane-blended resins are a bit more tenanious...in which case, I use a tea pot which whisles at you when the water is boiling (those tea pots have a small diameter hole at the pour spout which allows a bit of steam to escape, alerting you that the water is boiling). I hold the part careful above the steam port as it whistles and carefully straighten out the part under steam flow. Slow and steady is the way to proceed as sometimes if the resin parts don't have adequate ductility...they break.
Another thing to consider is the resin geometry. If the part is relatively thin and without a lot of mass, then the heat input necessary to correct any shape problems is small...on the other hand, large, heavier and thicker resin parts with a lot of mass will require more heat input to move and it takes more heat "soak" time before the resin is flexible enough to correct any shape problems.
Hope some of this information helps; if you'd like, drop me an e-mail off-line and I'll be happy to provide whatever other pointers I can think of.
