If you are looking for some newborn photos, there are better out there, if you are looking at a quick and dirty set of wedding pics, there are better out there also (Im gonna want to do at least a few GRAND PORTRAITS with a setup and lighting and so on...)
I avoid any job I cannot do well, I have no issue saying "Someone else MUST be better at this type of shot than I"
When I commit to a shoot, generally I will start studying from that moment. I will review how the shot should look, what issues might come up and is there a new way to handle them, I also look at new ideas for the poses, and the props, hair and makeup options, and more... I look to understand the events I shoot and what the people in attendance feel about it. I look to know who the audience for the shots will be and how to best get their emotions going from the shots.
I want to create an image, not just take a picture.