if you can learn gilmours stuff, by hearing it do it.. spend all the time you need for it and do it..
basicly all the blues based people playing the same stuff, but everyone has his little tricks which makes the playing special, and when you hearing people you can hear those little tricks and copy them into your playing, maybe changing them a little, also try to play with as much feel as you can, dont just strumm notes.. add some things around, like bends, and vibratos and double bends....
but then again basicly the best way is to hear good players and to copy them