importing photoshop pics

Im having trouble importing my photoshop cs files in photoshop format, as a single layer into my final cut pro 4.0 timeline, the size is way off, its either to small or two big, and i have to readujst it in final cut, which isnt a big deal, but how do i import a photoshop cs file into final cut with the least amount of hassle?

Also, lets say i want to key out the background of the photoshop image would it be easier to do in photoshop or final cut, if its a solid background? What do you recommend?

Once my image is imported, I may want to animate the photoshop image, in final cut, (I dont have adobe after effects) so its primative, but it gets the job done, is there a setting in final cut that makes this rendering process easier on my computer, or perhaps another photoshop file format that would make it easier? When i have to re-render some movement i dont like it takes forever,