BKB

I'm not really new to the game, but BKB is probably the most challenging item for me to use. If I buy it, I'm scared to use it. If I'm desperate, I waste it on chasing a support on the other team. I just honestly get confused on when to use it. It doesn't help that two of my favorite heroes are Troll Warlord and Sven. Any tips?

I sometimes face that problem too. I think the solution is to actively paricipate in teamfight during 10/9/8 sec durabiklity, and then you can use it freely even for solo kills.

It's a little better now that it doesn't go to 4 seconds. I also have this problem, I also hate how my team always flame me if I use it too late or early :( I know you can mute them but I try to stay away from that.

Just don't stay away. It really helps you save your precious nerves as it is pointless to contact them, they will only flame and ***** about something.

Just don't let the enemies force it when it's the first or second activation; after that, it should've already made its job, so you shouldn't be worried about activating it. I mean, if you land a good stun and pop a 10 second magic immunity as a Sven, the teamfight is over unless the enemies have BKB-piercing disables.

In other words, use it right after a good initiation: don't try to be conservative and activate it after coming at close range, just pop it as soon as your teammate lands that Dream Coil/ Ravage/ Reverse Polarity/ Echo Slam!