Putting a different spin on that approach, I offer Option 3.
Option 1 of course is that I build your brick oven and many people like this (the same way that I like to keep my hands grease-less, and my knuckles un-skinned by handing my vehicle over to qualified mechanics who like to do that stuff).
Option 2 is where you gather information (from this blog and others), get the materials together and do the project yourself (a character building experience suited to many). You may also choose to build your first oven from cob, making the whole experience cheaper and faster, though less durable (see previous blog).
I'll pin-point a few reasons that this is a good option.
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2. You won't need the truck that carries the heavy materials.
3. When you come to a particularly gnarly point in the process, there's your friendly mason to guide you.
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5. It's the way we humans are intended to work and learn.
There are different kinds of investment. Time, money, and friendship. Option 3 saves you on the first two and adds to the third.