Well depending what area you decide to hunt. Say if in the woods. I know from experience that two hunters is best because if you see one up in a tree, one person can keep circling the tree because squirrels will go around the tree to hide from whatever danger is below. If doing it solo, then just taking a wake works as well.

If out in an open spot more: If you have a scope then trying to stalk in your best bet, as well even you dont have a scope. If you see one that is trying to hide, whistle a few times because at times it pop its head up to see what is going on. They sometimes do that after they go into their holes. Come to think of it, whistle a few times if you see one up in a tree as well.