If playing on an existing save, it's important to make a backup of the save prior to installing and activating M2. It's suggested that this save be kept aside for M2 updates. It's highly recommended that M2 is started on a new, clean save (new character/game) with as few script-intensive mods activated as possible. 'Maids II: Deception (M2) is a script-intensive mod with 1,033 scripts. This applies not only to Helgen Reborn, but any scripted mod. Missing scripts cause errors and will eventually corrupt your save, so I recommend using as clean a save as possible. Also, if you have any level character where you've installed and uninstalled a lot of scripted mods, you're eventually going to have trouble with your save whether you run my mod or not. If you're a level 80 character with maxed out skills and perks, nothing in the game is going to be very challenging.

While you can certainly play at any level, I'd say around level 20ish is a good sweet spot for a great combat experience. two text fragments from another mods more exactly

I've found some sad info who can support my theory.

Skyrim forgotten magic redone