Going into any legal situation without legal advice is a fools errand so id get a lawyer who's well versed in Condominium law
How long ago was he AGM and were you in attendance? there are time constraints on taking out a case
Last case we had took two years to resolve
You don't say where you are, or what the problem is, but if your local council has an arbitration facility you might try that to resolve an issue. Fethiye has such an office and they will try to mediate any dispute to avoid the legal process.
Another option is the 157 Advice Line. I know that that carries significant weight and is watched (and reports to) by local councils and district governor offices.
Neither cost anything, and don't stop you lawyering-up if they fail. Could also go in your favour if you can show you tried to resolve issue.