You really can feel that extra girth in your hand while you hold your dick, I mean big time. I gained 1inch in girth but it took me 3 years to cement my results.
Pumping helps a lot but without any other type of girth workout your gains will be temp gains and not real. Start off dry jelqing to work on girth then advance to other exercises. You gotta experiment with different styles of girth workout to see what works for you. Me?? I started off jelqing and then went to clamping, and added in pumping to my routine.
I also feel that one day on and one day off is the best way for me to gain girth, you gotta let that dick heal and rebuild in order for it to grow. JMO.