Don't cut wet grass. The grass blades may not be standing up straight and
this can cause an uneven cut. The clippings are more of a problem and can
clump together and mat down preventing light from getting to the grass
underneath. Mowing a wet lawn can also lead to soil compaction. Wait until
your lawn is fairly firm and dry before cutting.
If possible, remove clippings from your lawn for the first year of growth.
This will give the young plants a better chance to spread and fill in
faster. (It is also important to remove leaves that fall on your lawn for
the same reason.)
Alternate mowing patterns. Mowing in the same direction all the time can
cause wear patterns and also lead to soil compaction.
Check for areas that are uneven. Some settling may occur and leave slight
depressions. Be aware of this and watch that you don't scalp the high spots.