It depends. If you are the kind of person who is organized, can do research, has the time to represent yourself (handle showings, answer questions, etc), and has bought and sold real estate before, then you can definitely do it. If however, you're in a hurry, aren't an experienced home seller, don't have the time to handle buyers and agents questions and showings, and don't have the time or experience to do your own market research, then you may want to consider an agent.
Selling your home without an agent doesn't mean you'll save money - buyers who buy FSBO expect a discount, and you're spending a lot of your own time and money on advertising, research, communicating with buyers and agents etc. You're also likely to have to pay a buyer's agent fee.