That might work, but doing practice fights ad nauseam? That sounds really real time consuming, and boring. Besides, I dislike x-bows (unusable on horseback) thrown (too quick out of ammo) and one-handed (not enough damage). And hiring no companion? The first companion I try to get is a good medic to lower own casualities and faster recover. Without a healer, a lowtier soldier party suffers too many losses and wounded even against a same size looter groop.
My usual campaing start: grab a few recruits, check available companions, run to get healer. If suitable looter groups cross my path, do them, otherwise just run. After I got the healer, gather the other 3 possible companions - one of trader type, one with good rogue and one possible group leader (no engineer yet, no scout yet). Collect a force of 17, and now I do every available quest while looking for the nobles for the banner quest and slaughtering every stupid bandit group that crosses my path.
If I think about it while playing, I try to recruit the 20th men in an area where the hideout are mountain raiders - but in most times, I don't think much about that. Me and 9 maxed imperial bowmen cut through every type of hideout.
And I don't like the brother char in my party. He steals my xp and needs an expensive outfit (his is really poor) - and he has such many redded skills that you can hardly develop him. His quatermaster skill is quickly matched by a trader companion.