First blow job

I’ve been with my boyfriend for ages, we’ve done everything else but I’ve had this massive mental block with giving him head. My main concerns are:

1. My teeth will hurt him

2. I won’t be able to get his dick wet enough and it will be uncomfortable

3. I have no idea what to do with his balls (what will hurt, how hard to suck etc)

4. How do I actually suck when my mouth is open wide

Any tips😉 pleaseeee xxx