Janet, I get better results using a table. On a lot of my frames I put some kind of decorative edge on them, when I do this I run the whole piece of wood through the router, and the same for the rabbet on the backside, before I cut it to length. You get a lot better results that way. Someone posted a link to plans for a dremel router table a few weeks ago on anther forum, I don't have the link but did download the plans, to look them over and it was pretty simple looking. Let me know if you are interested in looking at them.
Greg