Eli,
I always advise my clients to use the services of a realtor if they are buying a new home since the cost of the realtor does not come directly out of there pockets. Realtors do not only show houses, they are professionals at the legal aspects of the of buying and selling, so for most consumers they serve a great purpose by limiting their liability of the purchase or sale. Today's contracts are very technical, for they are built to protect both the buyer and seller.
On the other hand, I have many clients who prefer to sell their home themselves, they generally try to sell the home themselves for for the first month or so, but many eventually turn to the services of a realtor. The realtor has the data to accurately price the home and the capability to effective market the home.
The most important thing is to be comfortable talking with your realtor. Many of my clients do not care for there realtors, or they think they must use a particular realtor because they are on the sign and that's a huge mistake. When I say comfortable, I mean COMFORTABLE!!! This is someone who you must like, who you personality gels with etc... After all, you will be chatting with them about important issues throughout the whole process...