I would try being loose aggressive right from the start. Generally aggressive play is rewarded mores so as long as you can afford to be a bit more loose, play aggressive as soon as you have a made hand.
Once the blinds start becoming a factor for the shorter stacks its time to tighten up. If its a big MTT less so, but for STT's it important at this point to take tournament odds
into account. Whether knocking someone out is worth making a call with only a decent hand. If its only a small part of your stack, its generally worth it, but I will recommend playing rather tight once players start going all in or nothing.