immigration lawyer

ANY Belgian immigration lawyer is going to cost you a small fortune. The rules for residency, and subsequently change of nationality, are quite clear. Either you qualify or you don't, although the time taken for a decision can sometimes be a little frustrating.

If you think that the wrong decision has been made at any stage, you can appeal that decision yourself for only the cost of a little time.

No, because a GOOD immigration lawyer would tell you that you don't need one.

What's the problem?

Can really only confirm the comments above - As a UK citizen who has been through the nationality process here I can't work out a situation where an immigration lawyer would be of use - this of course assumes it is nationality you are talking about. Or is it related to a non-EU spouse, kids etc?. Additional context would help people to provide a recommendation.

I would highly recommended (but expensive) Fragomen in Brussels.