If using Do Not Disturb feature, will the alarm clock still notify me if set to do so?

Yes. But for your own peace of mind, test it on your phone and you will see the alarm still sounds.

Remember, if you do try and test it as randers4 says, you will need to make sure you put the phone in sleep mode for DND to work. If you set an alarm, turn on DND and the phone is still awake, it would work since DND does not work with the phone awake. So, set the alarm, turn on DND, put the phone to sleep and see if the alarm goes off.