Hi kylag,
Welcome to the Mattress Forum! 
As you may already know … Dormio is one of the members of this site which means that I think highly of them and I believe that they compete well with the best in the industry in terms of their quality, value, knowledge, service, and transparency.
You are certainly looking at a good quality/value mattress and as you know latex is also a very durable material so there are no lower quality materials or weak links that would compromise the durability or useful life of the mattress.
I don’t have any specifics on how to transition from one type of mattress to another, but there will certainly be a break in and adjustment period for any new mattress or sleeping system (not just latex) as the foam layers lose any of their “false firmness” and the cover stretches and loosens a little and your body gets used to a sleeping surface that is different from what it is used to (see three important points in post #3 here). This would typically be a few weeks but it can be shorter or longer depending on the specifics of the person and the mattress. It can be quite surprising to some people how much their sleeping experience can change over the first few weeks of sleeping on a new mattress and I would tend to give any new mattress about a month for the initial break in.
I would place a phone call to Dormio and see if they offer an expedited service. Many manufacturers will, usually for a fee, offer a program to accelerate your order. I’m unaware if Dormio offers such a program.
I look forward to learning what you decide to do.
Phoenix