Do it on a scrap piece first!
But yea it makes a WORLD of difference, I think you will find it'll take your already great builds to another level!
I usually have my iron set to around 360 F (just under 200 C.)
Take your time, if the foam instantly melts, you've got the iron too hot.
initially I start at a 45 degree angle (like a bevel) just to get the lip formed. As the two sides come together I start "rolling" the edge which produces a super clean leading edge.
I will caution you... it will add some time to your builds, and once you start, you will want to do it to all your builds!