We have traveled with Skarpi with that organization and would go back with him. In fact, my wife and I, along with another couple plan to book him next year.
If you can count on one thing it is that it will be windy- very windy. I would take the more sturdy tripod.
You should not have any problems contacting the the Chamber of Commerce in Reykjavik, for the support you desire.
(My wife and I(and friends), will be taking our second trip to Iceland, July 4th and again early next year).
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