I tried learning algs by way of actually memorizing the notation, but it's very inefficient and I highly recommend against it. The best way to to things is to first repeat the alg over and over and over, and notice patterns in the alg. After you start noticing the patterns, try to recreate the alg, slowly, without looking at the notation. Doing this will allow you to see how the pieces move, so you should be able to so an alg with your eyes open before you can do it with your eyes closed. After that the alg finds its way into your muscle and visual memory much much easier. Plus it gets really a lot easier to learn algs after you've learned a bunch. Also, PLLs are among the hardest and longest algs to learn, so don't worry about other algs, OLLs are much easier (mostly)