A felony conviction, regardless of the penalty imposed will cost you your state and federal gun rights.
To restore your firearms privilege you will need an annulment of your felony or a pardon from the governor. If your conviction was more than 10 years ago, and if you have not been in further trouble with the law during that time, you should be eligible to apply for an annulment.
You would need to petition the judge in the court
where you were originally convicted. Annulments are discretionary, meaning that the judge does not have to grant one and, generally you can expect the prosecutor to oppose the petition. If the petition fails, there's a three-year waiting period before you can try again.
For those reasons, even though you don't technically need an lawyer in order to seek an annulment, your best chance of obtaining one would be with a lawyer. Once you get the annulment and the state restores your gun rights, the Federal government should lift its bar as well.
There are lawyers who specialize in pardons, expungements
and restoration of rights, and that's probably your best bet here.