There is a method where your testicles are on the front of your abdomen above the pubic bone. They settle into slight hollows there and once a pair of tight panties are holding them in place, they look a lot like just a female mound.
It's a little awkward to do, cos one can easily slip back out whilst you are doing the other side :-s
Take your left testicle and work it up inside the skin bag of the scrotum, right up over the outside of the pubic bone and a little to the left and it will sit in a slight hollow there.
Getting the other side up into the same position without the left one slipping back out is fiddly - one of those situations where you could do with a third hand.
Some people then wrap the spare scrotum skin around the penis though I never did.
Once you have them both in place, hold them there with the splayed fingers of one hand, push the penis right down underneath towards your ass and pull your tight elasticky pants up to keep it all in place.
The end result looks pretty good, the testicles aren't uncomfortable and sitting down or crossing legs is much more comfortable cos there's a lot less in between or down below.
If you shave the necessary areas you can use tape to hold everything in place - that means that you can sit to pee and don't have to do the entire tucking again