Different for everybody, guess it's all in the approach.
There are those who jump in and want to change everything, those that want to study everything before they make any changes, those who want to let it ride and see what happens, and those that are scared to make a move! Currently working with all of them and let me tell you its interesting.
For my part, I appreciate those who want to jump in, get the lay of the land, do what needs to be done and leave the rest alone, but check in every now and then.
One thing I've learned for certain, you can't learn anything if you think you know everything, and there is always something someone else can teach you!
And we're off...