Yeah practicing on junkers first is always a safe bet, I did that also.
I have both a Wicked Edge Pro with extra stones & the leather strops, & the Ken Onion Worksharp with the blade grinding attachment & belts up to & including a leather belt..
I do occasional sharpening for a local gun/knife shop to make a few bucks. That shop is kinda funny. I had never heard of the shop until last year even though it has been around here for years. My son (who is a college football coach after playing FB himself for 4 years in college) was working a temp summer job last year mainly to help out a family friend who had a death in her family.
My son (now 26 years old) has a half dozen Emersons. I bought him a CQC-11 a few years ago & that hooked him on Emersons. While he was working the temp job, he came home one day & said that he worked with a black dude that had an awesome knife collection. He had something like 20 Emersons in the collection but had never really gotten the hang of sharpening.
My son showed him the mirror edge on his commander & the guy said "OMG that's awesome, can you sharpen mine like that??" He told him that he didn't sharpen it, that I did & then the guy asked "do you think your dad would sharpen a couple knives for me??" I told my kid to bring a few home with him & I would knock them out for free.
He stopped at my house after work & left me a Patriot & a very pretty rosewood Sebenza. I did them up nice for him & he was ecstatic with the result. When I met the dude in person 3 weeks later, he was a GREAT GUY. He is 6'7" tall with multiple tattoos & dread locks half the way down his back. I am maybe 5'6" tall, so the 2 of us look kinda funny together LOL.
Well it turned out that this guy was best friends with the owner of the knife/gun shop & he showed him the new edges on those two knives. The owner was impressed with the edges also & called me up to bs a little. It turned out the guy had never really gotten the hang of sharpening a knife either & asked me if I would do some side work for him.
I said sure as long as he didn't overwhelm me with work. I also told him not to bring me a $5000 custom knife as I didn't want to be responsible for something like that. He has been sending me work ever since & that whole thing has worked out great for both of us.
I sharpen freehand now with the Worksharp & the blade grinding attachment. I can get a blade just as sharp with that as I can with the WickedEdge & it is 100 times faster. I very rarely use the WickedEdge anymore.
~John