hey drag
put some lotion on it and get it to semi erect and do the ok sign and push it to the head. it might take a few strokes to work up enough blood to where you get to about a half inch or an inch before the head untill u get pumped at the end. keep in mind that the end depends on where your blood level pump is at that pint of erection level. just esperiment untill you feel that at least some area under the head is pumped too.its alla personal thing. i would look at a porn pic or whatever u need to get semi hard and start there and then look away and look at it like a workout.
keep alternating hands. under hand or overhand whatever feels most comfortable to you. the point is to keep pushing all the blood your brain sends too your cock at the end of it like your trying to milk it out. dont go too fast i would make each hand last at least 2.5 seconds. if you feel any pain just let your grip loosen a little. you have too find your groove man. take the time to find your max intensity and do whatever you can untill it hurts and then scale back. its called instinctive training