>>954623If you choose to open the blister, have something on hand to dry the area out and something to bandage and pad it with. I have used things as simple as hand sanitizer and moleskin.
>>954435Athletic tape is good. I recommend the 3in climbing tape.
>>954420pic related
>>954412Then get you to an REI or whatever and take the first aid course or, better yet, get your EMT-B