There are many You-tube videos showing step by step. If you're slightly handy with small screws it's not hard. I've replaced my Samsung battery twice over the years. Look into it before you cast doubt and lose hope.
However, that does not leave me with workable alternatives. I respect what Fairphone is trying to do, but €500 for a replaceable battery phone with internals several years old isn't the right choice for me.
But.....why? It's hardly any effort. Saying "I won't fiddle around with a screwdriver" is a stance as respectable as someone saying they are proud of not being able to do maths or know basic geography facts.