You do not necessarily need a lawyer to form an LLC, but I would suggest consulting with one to discuss why you would need one.The value of counsel is not in creating the entity itself, it is in creating the scheme to achieve what it is you want to achieve. To that end, the three most important reasons you may want to create an entity are liability protection, asset protection, and taxation.
Adrian’s article discussed some of the issues involved with the liability aspect of an entity. Namely, you can still be sued for your individual negligence and you can conduct your business in a way that would lead to the corporate veil being pierced.
In terms of asset protection, an LLC may not be the best option if it is a single member LLC. Many states have allowed the creditors of the single member to go after the assets of the LLC itself. This is different from what happens where a multi-member LLC is involved. In such cases the creditor can only go after the member's distributional interest and not the LLC's property.
As far as tax purposes, it is my understanding that the IRS will treat a single member LLC as a sole proprietorship. My suggestion is to consult a professional and discuss these three factors with him or her. Then decide which entity best suits your needs and draft the appropriate documents.