<human>: Can you give me the gist of the text in a nutshell?

This fuck up happened last month. I'm taking a college sewing course, and this involves industrial equipment. These sewing machines can go through a fingernail like a hot knife through butter. I've been at the college for two years, I've heard all the safety lectures, and I've stopped using the safety equipment because I'm just so damn full of myself... you know where this is going. I was sitting at my machine, with my right leg (the one I use for the pedals) tucked under me, just setting things up. I was screwing on the presser foot when I subconsciously though "how am I gonna sew with my legs all twisted up?" so I went to uncross them. I have done this a hundred times before without incident; but this time when I uncrossed my leg my foot decided to land smack-dab on the sewing pedal instead of the floor. I was concentrating on screwing in the presser foot on tightly, so I step down hard and the machine starts to sew, with my hand right in the danger zone.

I thank our great, noodly lord I hadn't put the needle in yet; as it was my thumb got trapped between the presser foot and the needle bar so it was pummelled for a few seconds. This is basically like getting hit fill-force with a hammer 7 times. The nail started to go black immediately and my thumb swelled up twice it's normal size. All of this the goddamned week before my final project was due. 

Once I got home I showed my dad (mechanic, lots of experience in nail injuries). He goes to his toolbox, pulls out a small drill and says "Listen, I know this is going to sound barbaric, but there's a lot of blood pooling up under that nail, and if you don't release the pressure- it's going to pop off. Take this drill, and make a little hole to release some blood." And so I did. One month later, it is slowly falling off.
<bot>: Got my thumb nail pummelled by an industrial sewing machine, had to manually drill a hole in it to release blood.