The gas irons are cool for portable use but I think most would agree that a station is best for the bench and working on the kits. One doesnt have to have a digital temp readout, just a decent adjustable. I have an older station with LED bar indicators and I would probably miss not having some type of temp. indication for reference but I wouldnt have to have it. Mine is not nearly as precise as a good digital temp. readout but I know the station well and it has worked perfectly for me for the past dozen years or more. The entry level Weller station (WLC 100 I think it is) does the job fine in the $40 range and I know it's a very popular recommendation for those needing a good kit for little money. You can do better as you spend more but point is, you dont have to spend a bundle. I would agree with you on the non temperature adjustable pencil irons not being a great choice. I went through a lot of those things before I finally bought a decent station, I wouldnt use one for a kit. I had a cheap gas run iron years ago and I dont think I would have built a kit with it. Not the one I had anyway. I used it for some wire soldering in the car (for car stereo) and fixing things like boat trailer wiring and things like that. But if one had a decent one and was familiar enough with it, Im sure it would work for a kit. Im no expert on any of this stuff, so just my 2 cents.
Anyway, sounds like you have some soldering under your belt which, I think, really helps. The instructions are so detailed that you dont need to be able to read a schematic (I cant) or even be able to fully understand the circuit to be able to build the kit. Some manual dexterity and soldering experience make it a bit easier to get it working on the first flip of the switch. That and something to help those of us with failing eyesight to see some of the smaller details. And again, lots of good people here to help with any problems or give tips and advice along the way. You'll do fine.