What you should do depends on the specific question you are interested in but if you want to test if the intervention has an effect on the behavior at all, you could consider McNemar's $\chi^2$ test. For the attitude question, a paired sample t-test would be pretty standard but other techniques are available, especially if you are nervous about the assumptions of the t-test.

Note that before/after measures have their use but including a control group is immensely valuable, if at all possible. You can look at http://stats.stackexchange.com/questions/3466/best-practice-when-analysing-pre-post-treatment-control-designs for a discussion of the various approaches to this design.