the easiest way to not do this is to just learn proper edgeflow and topology btw.
relying solely on the knife tool and booleans will result in a thousand and one Ngons and while they have their place you do not want those in a model meant to be deformed and animated
"If you are a 3D modeller in the FNF community, and you use the knife tool subdivision 3 I will nail you to a wooden cross and drag you against concrete. Learn proper modelling habits instead of smashing clay together like a damn child."