so it's been about 4 years now since i started. each workout - either heavier weight or more reps. you get to a point with that where you wonder if you can go any further. but there's one story written by Ron Harris (the bodybuilder) that really helped me with the motivation. it was basically about a young guy who wanted a pro to train him. so he took him to the beach, and held this young guys head under the water. then he finally came up gasping for air, the pro says "remember how much you wanted that next breath of air while you were under the water. that's the kind of desire you need to have for being a pro."
now while i'm not aiming to be pro or anything like that, but that's the kind of dedication you need, if you really want results.
like Big Ronnie says "ain't nothin' to it but to do it!"