It requires personal strength of the leader. A clan leader will deal with a variety of people with different attitudes and personalities. This requires personal grace. Sometimes the leader has to make an effort not to lose it. Just remember, no one is perfect and your members WILL piss you off.
Clans require time and lots of it, more for the leader than for the members.
You must carefully balance your real life responsibilities against your clan responsibilities. Real life, as always should come first. This is of course regulated in how you fit into your clan as a leader and how it is set up. However, don't try to run a dictatorship like a democracy or vice versa. This is VERY important.