@Julio Velazquez,
HML's are not all created equal. Rates & Terms are important, but there are other things to consider as well. Many investors go out shopping for what they think is the cheapest money so that they can make the biggest profit possible. I agree with it in concept. Both my experience as a lender and borrower for my own projects, cheaper is rarely the case. You also need to ask about fees. And I mean all of them. Is there a fixed cost type of fee at closing, are there draw fees, is there a minimum amount of interest due, is there a loan termination fee... The list goes on. There are a lot of lenders who offer cheaper rates & longer terms who fee the heck out of you along the way. When you are out looking for a good lender to work with, you need to get a list of everything from them and then start adding it into your costs. You may very well find that 12% & 2 point loan is actually cheaper than a 7% & 1 point loan. On the surface, you would never suspect it.
Back to your original question... Should you use HM for your first flip? The answer is maybe. Only you can truly answer that question. You have to look at all available sources of funds. Here's a brief list of questions you should be exploring...
1.Do you have any cash?
2. Should you use it?
3. What's the benefits to using your own money?
4. What are the draw backs of using your own funds?
5. Do I qualify for a bank loan?
6. Do I qualify for a Hard Money loan?
7. How much profit is in the deal? Not just cash, but what are the percentages. Margins are percentage based. What's your margin?
8. Can the property support higher costs and still maintain a good healthy margin for you?
As you consider all of these things... Keep this in mind as well. There is a big difference between a direct cost to you and making a little less when you sell. Direct costs come out of your personal pocket. Making a little less is a lot safer and better position to be in. If the property can support the higher costs of the best HML you get, go for it. If it doesn't, I would suggest it's not as good of a deal as you probably think it is.
Anyway, just my 2 cents.
Good luck!