This is a good way to practice on something with a low value, but it could make it difficult to actually learn on. The problems with the grinds, uneven spines etc can be a real challenge/confidence killer.
For what it's worth, you may be best to get a good razor and a barbers hone and practice only when you need touch ups... then when you're comfortable, try a full honing (again on a good razor). Good razors hone easier, with the exception of a good razor hardened to a ridiculously high Rc hardness.