Since it is your first offense, a lawyer could drop
those charges even more. Honestly, a lot of this stuff
depends on the judge or the area you live in. What you
could do is get a consultation with one or more lawyers
(initial ones are usually free at most firms), and they
could tell you what they can or cannot do.
Of course, there are no guarantees either way. But a
reputable attorney would probably be straight with you
about whether or not it was worth your time and money
to hire him or her.