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Can you do it? Sure. Should you do it? Well, that depends on whether or not you want as good a performance as you can get out of the blade you're working so hard on. If you don't care how the blade performs then go ahead. Otherwise, quench in canola oil and then temper it properly.
If you're serious about making knives and not simply something that looks more or less like a knife then you might want to read the Stickies at the top of this forum, especially the one titled Before You Heat Treat your First Knife.You won't find everything you need in that post but it is a start. You need quite a bit more information on heat treating before you can count on creating a really good blade .
If you want to boil your blade in vinegar after the HT is finished it won't hurt the blade. On the other hand, if you were using a real blade steel like 1084 you wouldn't need to boil it, just dip it in ferric chloride and it will turn black in a few seconds ....
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