Well you "mix" it on the handle. I put a few drops of armor all on both sides of the handle, just enough to get it wet. Then using a T-shirt I dip a finger tip into the tru-oil and then rub that on the handle. It will turn a white'ish color once mixed. Then I generally rub that in a single direction blade to butt until it has a thin coat and just looks wet. I usually give it 5-10 minutes between coats.
After a few coats you can give it a good wipe to clear up any streaks. After about 10 coats, I'll let it sit over night and then hit it will some 000 steel wool. I keep repeating this process until the handle has a shiny overall appearance. For the last few coats, sometimes I'll just use straight tru-oil but a thin coat. It generally works out to be about 20 coats.
Then give it a day or two to fully dry and harden. Then just give it another good wipe down. I don't buff the handles as the shine from this is good enough. I use this same process on ironwood, blackwood, rosewood, cocobolo, maple, etc. It's not 100% necessary for all of those wood types but the protection it gives the handle is worth it to me.