All of mod's options are customizable so you can make it more or less challenging. But not less challenging than the vanilla game.
For customizing parameters you can edit config files called eventlist.lua, spawnlist.lua, weaponlist.lua and warmodcfg.lua using text editor. Preferably using Notepad++ with UTF-8 coding without BOOM.
You don't have to close the game for editing those files. You can do that being in lobby (lobby with choosing heist, NOT load-out screen) and all configs will be synced when you go to load-out screen.

don't work with ovk 193+. if you have crash - disable ovk 193+.