1) What were your biggest challenges as a new attending?
I think the biggest challenge was getting used to the idea that I was making the final decisions without having to present the patient. You will find yourself thinking twice about your dispos (should I really let that 18yo w/ CP go home?) and diagnoses.
It is very appropriate to ask yor fellow attendings for help looking at a film or figuring out what to do w/ a patient. For example, at Kaiser, all GI bleeds got admitted to IM, and the GI followed as a consultant. At my new job, which is a fee for service environment, a lot of the GI docs admit the GI bleeds to their own service. It takes a good solid month to figure out all this BS stuff. You will be asking your colleagues and clerks for a lot of help to figure out the basic logistics of your new hospital.
It is NOT appropriate to make a habit of "running patients" by your colleagues. Of course it is ok to do if you are truly stuck on something, but if you make a habit of it, you may be taken as a PITA guy w/ no confidence in how you handle patients.
Remember that the RNs will save you ass on a routine basis, make sure to be as nice to them as you can without letting them take advantage of you. For example, bring bagels on an occasioinal weekend morning, and they will love you. Don't bring them everyday, or they will EXPECT them. You don't want them to be "upset" with you on the day you are running late and can't stop by and get bagels.
Since you are going to a teaching institution, you will have to get used to stepping aside and letting the interns and residents get first and second dibs on procedures. You will be third in line to get the airway. Make sure you are damn good at getting difficult airways, because they may be the only ones you are going to be doing as an academic attending.
You are going to have to get used to interns and residents coming to you at all times from all angles to present patients. I am not in academics, so I can't really help you out too much there, but you will have to find your groove in knowing all the patients better than the housestaff does.
2) What were the biggest mistakes you made?
Taking and believing the previous guy's signouts. When you take a signout, listen to the guy, then go in and see the patient as if you are starting over. Take a few minutes and get yourr own history and do your own physical. Signouts can really get you into trouble. For example "Oh, that 90 yo guy fell, and has back pain. Check his LS spine xray, then he can go home", can very well turn into a syncopal episode due to a rupturing AAA causing his back pain.....
You are the best advocate for your patient. If you really feel that the patient should be admitted, push the issue w/ the consultant, and don't let them bully you into sending them home.
I'm sure there are others, but I gotta take off. I will post more alter if I think of anything else. You will do well. You are well trained, and will find that stepping into your new role will just come to you quicker and easier than you think!
Good luck