It will get easier as you build up strength, but you'll note that it'll really get easier as you improve your technique. There are a number of modules throughout the site dealing specifically with bending and vibrato so you have a lot to draw from. Try searching about.
I'm not sure of what type of guitar you're playing but dense, solid body electrics (like a Les Paul) really have beautiful sustain. My current electric is a semi-hollow body Gretech and I know it won't have the sustain of it's more dense cousins.