Answer -- Only if you want to increase your chances of succeeding!
Reason -- It's more complicated than you think.
The United States Patent & Trademark Office has tried to make the system for applying for federal trademark protection as simple and easy-to-use as possible so applicants don't have to hire an attorney. But it's still complex stuff. And keep in the mind the process of registering a trademark can take over a year!
Why is it so complicated? Because the USPTO usually finds some reason to reject the application on the first try. That means they'll send the applicant a letter rejecting their application and explaining why -- IN LEGALESE!
And that's where the lawyer comes in. The lawyer understands that legalese and can respond to it in legalese. The person who files an application without an attorney can be left scratching his or her head -- What do I do now?
I'm not trying to say it's impossible to file your trademark registration application without an attorney. It's not. And it's your right to do so. But please consider the length of the process (perhaps longer than a year) and the complexity of the process (You may need to cite specific case law in your response to a USPTO office action letter) when you weigh your options.
I file applications with the USPTO for reasonable fees, all explained up front. Call me, Greg DePaul, Esq., at (973) 376-8585 to discuss your trademark now.