If you are going to add an extra head to your head, take some time to make the following considerations:
1. Be sure you have the headspace. Some of you may have sloping shallow foreheads that cannot accommodate an entirely separate entity. You may have to take the modular approach, adding blocks to the skull cap to provide enough room to comfortably root your new copilot. Best to meet the extra expense rather then cramming the number two into too little a space. Nothing says amateur more then two big faces on a tiny little head..
2. More importantly, be sure the new addition has a complementary temperance. If you find yourself a compulsive panicker, frought with anxiety, then to get one of the same grafted to your head will only compound the problem. On the other hand, if you are sedate and meditative, your new addition may be constantly competing for your subconscious. In the world of duel operating systems, opposites attract.
Thank you for your time, and happy shopping!