It's not a terribly difficult quest. The raid boss in Garden of Salvation, however, is finnickey and very much a struggle to handle if you aren't paying attention.
It becomes easier with practice and the right strat, like all things. I still think way more could go wrong in the Crown boss fight or the Spire boss fight then the Garden boss fight. You have way more flexibility as to how you want to go about it in Garden...1 tether or 2 tether...rebuild land or just go full Warlock strat (unless you're doing the boss challenges lol). A simple boss clear can be as easy as you want it to be.