I just remembered that it CAN be a PITA, and I have my own little "trick" to master the k2tog tbl...
I pull down the next two stitches (or the knitted fabric in general, close to the next stitches [more like under the second stitch actually]) to make it easier to slip the needle in, then, after wrapping the yarn around the needle, I pull it up with the third finger, so it doesn't slip off the needle as easily as I pull it through.
But I think everyone has to find their own way of doing it. This helps me tremendously.
(I just did a little test with pencils and some yarn to see how I do it)