From beginning I snuck behind bandits and later Cuman and knocked them unconscious. Worked fine with a few exceptions. Had to fight or fled by horse
There are bandit v guard v Cuman battle spawn points. If you want stealth, wait till most die or flee then either try to sneak up on a guy and choke out or race through area on horse drawing away guy from group. Eventually, the NPC will give up pursuit. Then, get off horse, sneak up on him and make him unconscious (choke). Gives good experience and even better equipment
The fenced in area across the creek from Theresa’s home in Skalitz is a really nice spot to find a manageable number of bandits, good loot and good opportunity to practice stealth.