Noel, as far as transplanting goes, definitely keep a new transplant in full shade for a week or two before gradually moving it back into its 'natural' light. i.e. similar light situation to where it was growing in the wild.
Obviously you want to get as much root structure as you can with the plants you collect, but it's not always possible. It's important to prune the top growth to be proportional to the amount of roots you have. So for example, I would leave the newer, small leaves on a big EE, and cut off any really large ones as the root system probably won't support those big leaves after the move. The plant might die trying . .. so to speak.
Don't know what you'll have available down there, but I do fertilize all my transplants with a Miracle-Gro product called "Quick Start". It's a water soluble 4 - 12 - 4 formulation with B-vitamins and rooting hormones in the mix. I water immediately upon potting new transplants with this solution, and again in a week or so.
Humidity is also pretty important but I don't suppose you have any problem maintaining high humidity. It varies here in the winter, and when it's dry, I mist my new transplants with a spray bottle. No need for this in the summer months.
