Brew went well but ended up boiling off more than planned to I ended up with an OG of 1.072. The recipe says its should be between 1.054-1.059.
A few tips on your first question.
1) Boil off is a function of TIME and surface area/diameter of the pot. SO, your particular pot has a SET boil off rate per 60 min. It is worth the time to figure out during a brew or with just a water boil to figure out your pot's exact boil off rate, because it doesn't change.
2) Always make sure you stir the crap out of the wort before you take your OG reading. Gravity is a reading of density compared to water, so the density needs to be uniform throughout the solution to get an accurate reading. It is VERY common for extract brewers especially to get false OG readings because their wort is not mixed and has pockets of wort that are more/less dense than the rest of the solution.
3) If you DO end up with a legit 1.072 when you expected 1.059, then all you have to do is add water until you hit your intended OG, again stirring it like crazy so it distributed uniformly throughout the solution. Boil off is practically all water, so you are just adding back in the water you lost to steam, which brings you back to the intended density. Again, however, if you know your pot's boiloff rate, then you can compensate for that in your original strike water volume and not have to worry about it.
Hope that helps on your future brews!