Lots of excellent tips above.
It can also make things less enjoyable for the newer player if they feel they’re always struggling to keep up. This can happen if, for example, one of you likes to stop and gather but the other is more goal-oriented.
I’m someone who is easily distracted.. by shiny stuff.. and mature herbs.. and young herbs.. and butterflies.. and frogs.. My partner is a very experienced gamer and all about efficiency, and has helped me to level through several games, including GW2.
If you’re like us, it really helps to make sure the distractible person will have access to speed boosts (swiftness) at an early stage too.