First some background: I've been cubing for a while now and even though I've learnt some other methods, I still use Petrus for F2L + EO, which gives me just a few OLL cases and then full PLL, which I know. With this, my best average is roughly 27 seconds.
I feel that what I need to...
I can't tell from the images on:
if the edge you can't see matters for step 4a.
I also find this step to be tedious and frustrating most of the time, does anyone have any tips?