I normally hold some tredges at the top and wait to use them. Other than that, for last 4, i organize it into one layer then work on putting them together there, making sure no centers are separated.OK, for 5x5 edges I use the freeslice method. I'm okay at it, but my lookahead and last 4 tredges sucks. I use a shengshou 5x5. How do I look ahead for building the first 8 tredges? I just intuitively do the last four edges without any routine.