Hello Bin,
If you have not done so already, it helps to drain the system at the lowest point. Meaning apply the shut off valve first, open the faucet at the lowest point (usually in the basement or ... read more
The difficulty depends on many things.
I would say PT post is the way to go, but install it over a post standoff past so water doesnt get trapped between the bottom of the post and whatever it is sitt ... read more