How to aim?

[Soviet]

I have been trying to get into cavalry for a little while now, and I know it's not finished and is ridiculously hard to beat, but for the time being I would like to at least know some type of strategy.

At this point in time I can not even adequately aim as a pikeman, and I can't figure out what I need to do to even attempt doing so.
If you guys have any strategies to anything in this game mode it would be appreciated because I really think it has potential but it's so unfinished and hard that I can't get any enjoyment out of it.
It's kind of sad.

I know this isn't exactly what you were asking, but you should probably rethink your choice, as pikemen don't have nearly enough ammo to get through one wave after 15. I've also found melee to be very effective in cav.