To follow up on the nice post from @Jeff Hall, and while I understand that you’re trying to minimize your expenses so that you can maximize your return, I think it is particularly important to hire a lawyer when you’re forming a multiple owner entity. In addition to making sure that you form the entity properly, the lawyer’s job is to raise issues that may arise in the future between you and your business partners that, had you anticipated them up front, you would have agreed on. This is particularly true given the challenges of co-owner entities and the practical reality that many of them fall apart (and with unintended consequences) because the co-owners couldn't solve arguments months or years into a business. And it doesn't matter how friendly you are with your co-owner. I've seen best friends form businesses that fall apart because of disputes among owners.
Let me give you a hypothetical example of how a good lawyer can protect you. Let's say that you are going to be a 20% owner and that your partner will own the remaining 80%. What protections are you, as the minority holder going to have? Can the 80% owner sell the assets of the LLC without your consent? Can the 80% owner, without your consent, issue more equity and dilute your interests? Can they sell, without your consent, that additional equity to third parties (so that you're in business with not one but two people)? If you had thought about these up front, you would probably want to include provisions in your LLC Agreement that addressed these and other scenarios (a.k.a., minority protections).
Let me give you another hypothetical. Let’s say that you are going into business with a partner and the equity will be split 50/50. Two years later, you and your co-owner can’t agree on anything and your business partnership is failing because you can't agree. Yet you agreed on Legalzoom that neither one of you can transfer your equity without the other’s consent (one of questions that LegalZoom asks). How do you unwind the business amicably and out of court and how do you do so while maximizing the sale price? The answer is that there are many strategies that a good lawyer would be able to help you consider.
This isn’t to say that hiring a lawyer will solve all problems or that these issues would arise if you didn't hire a lawyer. After all, it's much more important to go into business with the right people. However, having addressed these and other potential issues up front, you're giving yourself a better understanding of the potential issues that can arise, you're giving yourself a better chance to succeed (at least I think this is true), and you'll also learn something about your potential business partner in the process of considering these issues and making decisions.
One other thing -- I would suggest that your accountant review your LLC agreement, as well. There are certain things from a tax perspective worth his/her consideration. (This isn't intended to be legal advice -- more my two cents so that you do hire a lawyer and get actual legal advice.)
I hope this helps. Good luck.