I just measure the ingredients "roughly" and same with serving I try to eye-ball halving or quartering etc and don't worry too much about being super precise. 5g is enough precision for me, unless it is something like cheese or other high-fat things. And I don't count vegetables at all (apart from potato)

Some days you'll go over, others go under etc.

It helps a lot of your partner is also weighing etc

Where it is really hard though is at a BigCo office where food is free and self-served. I have no idea what I am loading onto my plate - I try to search for something similar in the app and deliberately over-estimate the quantity knowing that there is a tendency to under estimate.

Really though weighing things is almost beside the point. It's about being aware/mindful of what you are eating. Without tracking it, it is easy to absent mindedly just snack on things and then entirely forget about that brownie you had with your morning coffee, or that ice cream you had at lunch time. You start to make choices like "Hmm I wont have that chocolate now because it would be a disappointment not to have some for dessert at dinner time" etc, whereas without tracking you'd probably just eat everything and not even realise/remember/be-aware of it.