[Agema]

One thing that only comes with experience is judging how powerful your units are; how much damage they can do and how resilient they are.

What I'd do is try a few test games with a nation that has a good bless unit - MA/LA Vanheim as an example. See how many basic huskarls you need to clear out indies. Then compare it to how many Van (unblessed) you need for the same job. Then try Vans with a huge combat bless (E9W9, F9W9, etc.) Also look at huge units like Pythium's Hydras or elephants/mammoths (Arco, Bandar Log, Caelum).

As these things are experience-based, there's no other way to find out than to playtest yourself and get an idea of what they can do.