I had trouble, then I remembered avocados.
Well, actually nectarines, but "avocados" is so much more exotic sounding.
First remove footgear. The patient's, that is.
I would place my entire index finger along the side of the foot inferior to the malleolus and
feel. You don't crush a nectarine (or an alligator pear) to check if it's ripe, you gently palpate and concentrate. Maybe shut your eyes. This may "scout out" the pulse point, which you can then try to "concentrate" on. If it eludes you, retrace your technique, mark location, then try a few other spots nearby (due to idosyncratic relocation, such as due to old trauma, or "just being made that way" as my own MD says). Anyway, many folks are taught or teach you to mash down, and if you are excited you will tend to mash down, but that is not always gonna get 'er done.
Also, if you are worried about an artery, consider that there's damn little you can do about it except splint treat for shock and boogey, and it will quickly create a "downstream" condition of relative pallor and coolness. (Take off BOTH shoes and socks). If there is a breach of an artery, too, that blood's going somewhere that's going to get swollen and tight eventually (although in the glutes or thighs that can take far too long, the location of trauma will suggest that injury). Finally, if something hits an artery hard enough to injure it, there's going to be PAIN; if the pt can tell you where it hurts most, and mech of injury suggests vascular damage at that location, there's your clue.
Oh, and by the way, there's a case for protecting your wrists from repetitive motion injury...carpal tunnel injury often affects the nerves going to the first three digits, which means you have to re-learn how to palpate using other digits. Back off the Gameboy.