You will have a great time. My buddy and I returned from our first trip about 2 weeks ago (Galapagos Sky) - the trip definitely exceeded expectations. Several whale sharks up close and personal, huge schools of hammerheads, mantas, amazingly playful sea-lions, penguins, the marine iguanas - amazing diving.
I would agree with most of the comments above. We had folks with a wide range of abilities/experience on our trip, including a German couple in our zodiac group who had about 20 dives of total experience each (not recommended). That said, they hired a private guide for the trip.....which worked out very well for them and for us. They had a great experience and were safe.....making it a win-win for everyone. There was one other solo traveler with limited experience on the other zodiac who did the same.
There were three important safety procedures we were briefed on during the prep for the remote diving at Wolf and Darwin islands: (1) SMB usage; (2) Divealert; (3) EPRIBs....to be utilized in that order in the event of separation from the zodiacs. The Sky had spares of all 3 for folks to use. I had my own sausage/spool and Divealert and had practiced with them at home in New England before the trip. The EPIRB is easy enough to use and clips easily into a pocket.
In addition to the familiarity with thick suits and gear, the other thing to consider is how the diving is conducted at Wolf and Darwin, where there are often strong currents. Negative entries tend to be the rule, and once you reach the bottom you find a crevice and/or grab onto a barnacle-covered boulder to brace against the current and sit tight to watch the amazing marine life show in front of you. For us, sometimes the current was pretty pedestrian; on a few dives it was like being a flag being whipped by a strong wind, sometimes going hand-over-hand to get in position against the current. Good to use the shelter of large rocks or other formations to make moving around easier.
On one dive, our group moved from one viewing area to another, but i thought we were heading into the blue...by the time I realized where everyone else was going the current had me and away I went. I knew the right decision was to go with the current and not blow all my gas trying to swim back to the group. One of the group saw me and came along - I sent up the SMB, we did our safety stop calmly, and then surfaced 300-400 yards from the nearest zodiac in relatively bumpy seas - I could see the boat every second or third wave. I got my 6 foot Halcyon sausage fully inflated and my buddy began blowing his whistle. The zodiac driver said he indeed saw us the whole time given my big sausage that I was constantly lifting as high as I could...but it was a good 10-15 minutes before they got to us, as they were picking up the rest of the group. No big drama...it just illustrates the need to be comfortable in current and doing blue water ascents, deploying an SMB and making yourself visible.
Reef hooks - 50/50. No one on our trip had them...hands and crevice-wedging seemed to work. If you use one you would need to have it on the shorter side. Also, the hammers seem to be on the shy side - video lights or divers actively swimming or hovering seemed to cause them to move away.
Camera - better to bring it. The initial dives prior to Wolf/Darwin are definitely lower key. Many of these "easier" sites had great things to see, especially the sea lions and marine iguanas. For Wolf and Darwin, really depends on conditions and your comfort level. Add a camera to the things above, meaning in the event of having to deploy SMB/spool from depth, do you have a way to secure/clip-off the camera and not have it get in the way.
Just to end on a more positive note - here's a link to the video I put together from our trip. Hope you are able to see all of this and more
Chris
Galapagos 2018