Okay, I understand that it hurts to sit and walk, but it really depends on where the boil is actually located. If it's ermmmm....in your bum crack or you're running a fever - see a doctor as soon as possible.
A "pilonidal cyst," is a boil that occurs between the buttocks, and is a special case. These ALWAYS require medical treatment, including drainage and packing (putting gauze in the opened abscess so that it continues to drain). Finally, any painful boil that is not rapidly improving should be seen by a doctor asap to prevent further infection.
The usual treatments for regular boils include putting hot moist compresses on it ( a wash cloth is ideal) and then poking it with a sterilized needle and then gently pressing on the sides,( rather than squeezing ) to help drain the abscess, but only when it is soft and ready to drain. See a doctor if it doesn't clear up after the first treatment.
I hope this helps....... and that you feel better soon !