Done it a few times for various people, most of the time its a temp solution but one or two are still going. Ive had a play around at work with more "pro" methods one involving me profiling it and running through the reflow oven and others using an infra red rework station, they both are working fine.
Im pretty sure i put my YLOD guide up in here somewhere, just dont rush it, be careful and make sure the heatgun is not set to a to high temp and flow. A useful tip is to get some kitchen paper and adjust the height on the heat gun so it slightly browns the paper as you move it along, this will be around the correct distance you need to be from the main board.