My tip for the megaminx is that all the algorithms are the same as the 3x3x3, they just go off at weird angles. If you can keep your focus on a corner and treat it like a 3x3x3 you should be good. The last layer is odd to get the edges, I use the same algorithms, but the patterns to look for are different and the edges move a little differently since there's an extra edge that moves around. The corners are pretty easy in the middle portions, so I just put them in place while being careful about the completed parts.