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Yes, what the other guys have said is good advice.
Size of the blade doesn't matter much. You can get good shaves with any size, the thing is, you will not know what size you prefer before you have...

I think you will be able to get BBS with a straight.
You just won't for the first few shaves/months.
Once you get your technique down and are using proper tools, you'll get there.
I have used DE's...