If you think 5.6 is where you want to start, I would suggest starting lower than that.
Do Bunny (5.4) which is fun and ez. Then Gelsa (5.4), which is spectacular and forces a gear anchor at the end of pitch 2. If all goes well, try Horseman (5.5) which will give you a feel for what a gunks 5.5 is like. If you feel totally solid on this, try Jackie (5.6). If you feel totally solid, then check out the 5.6 post that is still fairly fresh
Have fun, and dont get over your head