It is not that difficult to build a TBH. I normally used scrapped and used woods to build it.
I need about 1 hour to finish building a TBH including the legs. I sometime build a table top instead of the legs for the TBH.
You should go ahead and try to build one. You may have difficulties in the beginning. Once you have built 1, the rest will be easier.
Remember, there is no right or wrong in building a TBH. Just follow the standard design that you download from the Internet.
You may have to adjust the measurement but do not take this as a barrier to build your tbh.