Sure, that's pretty common way to touch up side to side wobble without even taking off the tire. If you take the tire off and put the wheel back in the frame, you can use the frame and brake pads as a pretty respectable truing stand. It's harder than using a real truing stand, so if you are new to truing, it's an extra frustration. When I was new to truing, I was also poor, so I did this before I got a truing stand.

Buy a good spoke wrench, I can't stress this enough.

Sheldon