Yep, fengshui is pretty hard......and time consuming.....
You also need to be good in math too.....and logic....problem solving skill....not easy...
Can suggest you few books first for xuan kong. 玉函地理玄空解秘 駱氏玄空秘訣.巒頭風水尋真
中國堪輿學 三元陽宅精義
The rest is pretty much 99% BS, don't waste time on them.
玉函地理玄空解秘
May contain some secret, serious secret.
Cheers...