Ok, your best bet is to rake the sand flat using an ordinary garden rake.
Work your way to one spot where you have a ladder straddling the wall, once outside, remove ladder, rake sand in that spot.
Now, not sure how your liner guard installs, but you could install in, tape sections together, roll it up from each end to the middle, THEN rake your sand from the middle towards TWO opposing ends (separately), every 2 feet or so of raking, roll the liner protector towards you so it essentially follows you to the wall, flip the last bit after fixing the sand where the ladder stood.
If you need to check and see where your sand levle is at right now (in comparison to the top of wall), stretch a string across the pool tightly and measure down to the sand to measure the current depth.