conversing with someone(s) about building my own barn
I don't want to be a wet blanket, but for an individual who identifies himself as not having much experience, you have taken on a huge project. Unless you have substantial welding experience, welding up your own trusses (I assume that is what you want to weld) is a difficult proposition, as the integrity of the welds are critical. I have no idea what your basis of design is, generally the steel trusses for a barn are designed by a structural engineer, as is the rest of the barn.
You may want to take two steps back, think carefully about what you want to accomplish, and seek some professional assistance both in terms of designing the structure, acquiring the appropriate permits, and constructing the building. Raising large steel trusses is going to require a crane, which of course needs to be rented, which is a whole other issue.