Let me try this one for a start. Yes, you can HT with propane or O/A and there are lots of books that will tell you how to do it. The heat treat will not be the best it can be. It may give you a serviceable blade.
If you try to build a raft from hand, it won't compare with the average bass boat - but it will probably float and you can catch a bass off it. Same idea.
A2 may not be the best choice for this start process. 1084 (or something similar) may be a bit more forgiving. The important thing is how you represent the product. It's great to say "This was my beginning - and I have grown from there." People get upset when someone claims more than they have accomplished.
Let us know how it goes. It may provide inspiration (or avoidance) for others.