The process is that at the AGM the owners have to first decide on how many people they want on the EC (minimum one, maximum nine). Then they call for nominations, then if there are more nominees than seats, there is a vote.
You can nominate yourself unless you are the joint owner of a property in which case you have to be nominated by the other joint owner. You can be nominated by another owner and you can nominate anyone you like, whether they are an owner or not.
You don’t need a seconder but, if it comes to a vote, you will obviously need support.
Being a member of an EC can be an incredibly rewarding and valuable experience … depending on the other members. For the same reason, it can be incredibly frustrating and painful. Be careful what you wish for.