wet a washrag and lay it flat in your freezer for about 10 minutes. Right after I get out of the pump I jelq and massage it for a few minutes until the color returns to normal and then wrap it in the frozen cloth. It feels really good to have that ice cold on my cock after it's been hot and pumped (I pump with rice sock "donuts" that I sewed up, I just slip them over the tube and voila it's the most perfect way to heat up while pumping). I don't get a donut unless I'm pumping for over 40 minutes nowadays, and when I do get one, they are gone within 6 hours, especially if I cold wrap after my routine.
Slow and low man! I pump at 3-4hg a lot and rarely pump at 5hg, if I do get up that high it's only for 30 seconds or a minute, and when I pulse pump. I know it's exciting to see how big it is in the tube, and how thick and floppy it is afterwards. But, take it lightly!