1. You cannot be in two places at once.
eg. talking in the bonfire thread while invading a dungeon
2. You cannot have any affiliation with any canon character unless they're required for your covenant.
eg. having greeted the princess and being inducted into her covenant would be required for the Princess's Guard covenant.
3. Ensure your stats fit the gear you have chosen. (SL 50).
eg. wielding a greatsword while having a dex build.