Hiamakki, anyone can do it! It's fun, easy and inexpensive. As you see I do it in my backyard with ordinary household items. All you need are some seeds, potting soil and cups! I have a paper I did for my rose society if you'd like I can email it to you if you PM me your address.
David, every single seed becomes its own new variety! There are only a handful of species roses that will grow true to variety from seed and then only if they are self pollinated. So if I have one hip from say, Peace, and that hip has 6 seeds in it and they all germinate, I will have 6 brand new varieties with Peace as the mother (seed) parent. Even if the hip was a self pollination each seed will contain a different mix of the genetic make up of the parent rose, Peace. Each one will have different traits from all of the genetic background that produced the Peace rose. So they can be any color or form, have stripes, lots of thorns or none or anything else. It all depends on which genes each seed had passed to it. If it is a cross between two roses (seed from one, the Mother, and pollen, the Father, from another) it can have any genetic combination from either parent and all of their genetic backgrounds. ENDLESS combinations!
Here are two seeds from a Blue for You hip
And two from a rose called Lynnie by Kim Rupert
I will tell you though that a lot of them have a kind of default setting (as Kim calls it) and turn out to be a rather humdrum 5 petaled medium pink bloom. A lot of breeders plant thousands of seeds and in the end only end up with one or two good ones that get introduced. It's a very long process. Particularly if you are breeding toward a goal, like a better color or form or disease resistance!
