Roll back the area, no cracks?? Then no problems!

Self leveling concrete is pretty easy to use but its not cheap!
(bags are around 30.00)

What I did was to clean the area, then use a latex primer to prep
the self leveling concrete a good surface to bond to.

Next mix up the batch, poor it on and spread it out. The the most
important step, LEAVE IT ALONE. Its going to level itself before
it sets up.

Make sure the whole process is done QUICKLY, this stuff likes to setup
pretty fast.
It can make a nice clean flat surface.