I am no pro, but when I cover I play it by area. If I can do two sections in a row I will. Just always end on a rib so your next section is merged over the rib (hides the join and gives it something better to grab on to).
I have been building for sometime so I cover in large pieces with wet tissue. I would not recommend this until you have been covering for a few years. You will be greatly disappointed in the results if you cover in too large of sections. I highly recommend following the covering advise from Guillows. That will guarantee a smooth wrinkle free plane.