JM, after applying a good lubricant along your shaft, hold your hand out in front of you like you are going to throw a slow pitch softball, palm up. Curl your fingers upward just like you would have to to hold that softball in your hand. Now turn your wrist so that your knuckles are facing your stomach. Split your middle finger and the finger next to your thumb and slide the base of your penis into that groove. Focus your pressure on the sides of your shaft as you now stroke upwards, stopping at the base of your glans. Now repeat with your other hand. V-jelqs work your cc best. If you do these correctly, your glans will be rock hard as you approach it (test it by touching it with your other hand). If your glans is soft, apply more pressure. Remember, no matter what pressure you use, keep it uniform as you glide upwards, and also, this isn't a race, take 3-5 seconds per stroke. People talk about keeping your erection level around 50%, but I have performed these from nearly erect to almost flaccid.
On regular ok jelqs use the overhand grip to get your grip as close to your base as possible. I concentrate on getting my pointing finger (finger next to my thumb) right on my cs (the spongy tissue that runs along the bottom of your shaft). Most of my focus on ok jelqs is my cs, so my finger rides up it the whole length. My cs has more than doubled in size from these jelqs.
I would suggest doing one to three sets of 30-50 each of the ok jelqs and and v-jelqs. Doing a set of each gives your fingers a chance to recover from the v-jelqs.