A great article over at About.Com details some home repairs that you shouldn't put off. Some of these are simple but important things to handle. If you find yourself in over your head on any of these you may need to call a professional residential contractor or another qualified professional. Some of the more complicated ones are:
High risk in many ways but can be equally dangerous if left unattended. It may be worth the extra money to let an experienced handyman or professional to handle any roof repairs.
This is one that should be addressed immediately after discovering. It can lead to horrible water, mold, and structure damage.
To read more of the list click here.