That is a lot of task loading for a diver with so few dives. As has been suggested above, solo diving without adequate training/experience, not to mention a redundant gas supply is a bad idea. Not monitoring your gas supply is an even worse idea, but it is easy to pick a part someone else's mistakes after the fact. Constructive suggestion - skip these types of dives until you get in more practice time in the water. You need dry suit experince, reel practice and practice in low vis. Dry land reel practice can help, but it does not replace in-water practice - you won't get the same bird's nest effect without the water. You can quarry dive all winter and/or get some pool time. Most local shops will allow you (for a fee) to use a section of the pool while they are teaching other classes. If your local shop won't, pm me and I can help you out with this if you don't mind driving a little. Don't let an experience like this do anything but motivate you to become a better diver.
JMO,
Jackie