sounds like you're knitting english style (mostly right-hand) knitting with the long-tail cast-on. remember your working yarn should be in the back, ready for your right index finger to manipulate. and as long as you're sticking your right hand needle into the next stitch on the left hand needle from left to right, and wrapping the yarn counter clockwise, then you should be fine for a knit stitch. but it absolutely does take practice. sounds like you're well on your way!