OP - From what you say, you might be best not to doula.
With Baby #1 - I wanted as natural a birth as possible. DH is a nurse and had actually worked L&D at one point in his career. He attended birthing classes with me (those breathing techniques are a hoot!). I thought I would be fine with both DH and my mom. When I was actually in labor, it was certainly interesting. My DH was helpful (he did the breathing exercises we has learned together with me) but after some hours, my mom sent him off to take a nap and took over. She couldn't help giggling at the whole breathing thing and was completely UNhelpful LOL (did you know laughing HURTS during contractions?!). DH later told me he felt overwhelmed by the whole process and neither of us even thought to question any of of the dr's decisions.
I was induced shortly after entering the hospital (I was anxious and unsure and had already been sent home a few hours earlier). I should have been sent home again since I was still in early labor, but since I was there, they gave me pitocin. Some time later, the pain was bad enough I asked for help. They gave me Demerol. That put me to sleep between contractions, but I was awake and in full pain during each contraction. After a bit of that, I gave in and asked for an epidural. I ended up with a tear that took forever to stitch together (to this day I have no idea how many stitches as the dr refused to tell me). I think the pitocin started things on an unnecessary path. They never asked our opinion or anything - just said that they were giving it to me. Neither myself nor my DH were in the frame of mind to question it. I was never offered any alternative method to assist with labor (the hospital had a birthing ball, jacuzzi tub, etc etc - but DH and I just didn't even consider it).
With Baby #2, I was very close to hiring a doula. But after DH and I had long discussions, he said that he would be my doula. He was much more capable the 2nd time around (he was in the right head space). We were both more prepared and through prayer, very calm about the whole process. I used the birthing ball, ignored the stupid fetal monitor (we would hurry up to get it back in place whenever the nurse stopped in), and it went amazingly well. Also helped by my awesome OB who said stirrups were unnecessary and did perineal massage during the pushing phase (and convinced me to slow down when I was eager to push).
Looking back, it depends on your birthing expectations/desires and how well it aligns with your medical team. And also how prepared your support folks are to be supportive. A doula basically replaces an experienced family member/friend since in our modern world, few women or men attend births other than their own so it's hard to find someone with a lot of first-hand experience who can be calm and advocate for you.