I got all 4 out, partially because my dad had 1 taken out at a time in the navy and he didn't want that to happen to me. 
Ah, no wonder you suffered so much then.   
I still feel that doing 2 at a time is the best compromise between discomfort and efficiency.   1 at a time would make way too many visits.
I do admit to being somewhat of a wimp, though.   I don't like pain.
.