Scotland international Pressley was a free agent after coming to an agreement to leave Hearts earlier this month following his criticism of majority shareholder Vladimir Romanov.

BBC: Steven Pressley shows his delight at having joined Celtic

But be careful to get the agreement right with the agent, in case you end up selling privately, but still paying the agent.

BBC: Selling your own house: Could it save you a fortune?

Unless you have signed a separate agreement to pay a buyer's agent for his time, you won't pay any commission.

WSJ: Open House Etiquette

Each brokerage allots a portion of the proceeds to the respective agent, depending on the agency's commission split agreement.

WSJ: Open House Etiquette

That's probably why he's playing serious hardball during the current tense round of negotiations over the league's collective-bargaining agreement, the result being a 72-hour postponement of the free-agent shopping season that was to have begun on Monday.

FORBES: Upshaw's Magic Number