Anyone else find changing a light switch harder than it looks?

it is, the first time. the switch itself is simple, it's that older boxes are crammed full and the wiring doesn't always match the new switch. breaker off, test it's dead, then before you undo anything take a photo of which wire goes where. if there's a bundle of neutrals at the back of the box leave it alone. and a 3-way switch (two switches for one light) has an extra terminal, so check you bought the right type.