How to Manage Your Energy

I'm playing two tournaments in the next three or four weeks. I think it's important for adults to sort of manage their energy and feel no shame in taking a buy. The good news is I don't have to decide beforehand. So if I get an especially easy or God forbid, like horrible game in one of the first two faster time control games, maybe that can be OK. But certainly the way I'm leaning is 60 40, I'll take around three by and hopefully I can judge how I feel at the time.