I just stay loose, swing the arms, twisting with the hips. You have to get into a rhythm, just keep pumping.
I found the funnest way to spacewalk is to just manual around in circles, throwing in spacewalks here and there, the focus being on just keeping the manual not how big of a rotation you get on the spacewalk itself. Then just increase the ratio of spacewalk:manual and try to get them longer. Getting spacewalks to the point where you are doing a series of 180 rotations is the funnest thing but definitely takes a lot of practice to get to that level, baby steps.
I'd recommend just really working on your slow manuals, you've got the long tennis court manuals and whatnot, try manualing until you run out of speed then just keep holding it and spacewalk to get your momentum back. Switch to and from a manual to a spacewalk is a great way to quickly change your centre of gravity and momentum.