I like skinny jeans. The #1 rule with women's clothes applies doubly to jeans and triply to skinny jeans: try before you buy.
How severly I have to tuck depends on the jeans. With straight denim, I can get away with a mild tuck in ordinary underwear. However, my nicest skinny jeans are really stretchy. They stretch over parts where you'd rather not have stretch! So, when I wear those ones, I always wear firm control briefs with an aggressive tuck. The result, if not ideal, is at least plausible to a casual glance.