Hi, I've never actually maincalled on a team but i love being a tryhard team leader on tf2center.com. I'm not sure what class you play but I'm going to guess pocket.
- tell your team beforehand that it would help you a lot if everyone could try to follow your calls even if they think you're making the wrong decision. This makes it much easier for you and everyone else to learn which decisions were actually bad and which didnt work because only half of the team committed. Obviously, if theres a big reason for you guys not to push like "i just dropped" or "but they're respawning now" then yeah listen to them, but if its something a bit more subjective like pushing right or left then then they should probably just listen to you.
- Make sure your commands sound like commands and not like questions and vice versa. In the heat of the moment its really easy to mix up "should we go in?" and "lets go in".
- Don't just press tab to see if people are with you. Use your eyes to see who's around you and don't be afraid to ask if everyone is ready to push.
- Since most pushes start off with you rocket jumping to make space, make sure to call it. It helps everyone else know when you're actually in and not just shotgunning stickies on the floor.