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Buy something cheap by all means but preferably vintage with good geometry and not much hone wear etc. A little patience and you can get the no name German/English/American blades pretty easily....

Sounds like you need a second razor to practice on . When starting honing it will take a bit before you will get it right and even longer to do so consistently. Good luck

I would suggest technique is at least partially to blame and does take a fair number of shaves to get decent. In the beginning we tend to be hard on the edge so that is likely pat of it too.