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if it came shave ready as stated, then I would say try easier areas, go slow, and give it a chance. I really can't advise you on use of japanese straights, but persistence is key.
If you have...

I agree that technique may have something to do with it, but it shouldn't give you razor burn and miss hairs, that sounds like an underhoned edge.
I have a couple of questions for you.
1) Did you...