You're not stupid, just new to reading patterns. Since you're knitting the smallest size, just use the very first numbers when a string of them are given. So when you see - work 4 [4:5:5:6:6] - work 4 sts. Dec 1 st at each end of row means to decrease at the beginning and end of that row. That doesn't have to mean in the very first st, you can work 1 st, dec, then work the row to the last 3 sts, dec and do the last stitch. Many people like to leave the edge st plain so it makes seaming easier.
For the other sets of numbers -
41[47:51:59:65]; measure 10[11:12:13:14:15], (4[4 1/4 :4 3/4 :5 1/4:5 1/2 : :6]in)
after your decreases or increases you'll have 41 sts, measure 10" and 4"