The online forms you come across may or may not work. These forms tend to not be state specific which means your will may or may not be valid. If you are going to take the time to draft a will or any other estate planning document (which you should), you definitely want to ensure that it is valid. Visiting an attorney in your state will ensure that it is valid and properly executed so that your interests are protected.
Just like fixing up your house, there are jobs you can handle yourself and those that require the assistance of an expert.
A recent article in ABA Law Technology Today, titled "3 Reasons to Avoid Online Forms for Wills and Estate Planning,"points out some glaring problems with trying to DIY your estate plan.