The most important thing is that actually you should focus on veg rather than fruit (berries excepted). The majority of your intake should be vegetables.
I believe that for the purposes of this guideline a portion is about the size that you can fit in your hand, so yes, I could easily do 10 a day, and I usually do. Especially when I am seriously low carbing.
I don’t eat breakfast but an easy way to get one portion in is yogurt or porridge with berries. 1 handful of berries is one portion. I just eat my berries on their own a few times a week instead to get the benefits from them.
Lunch is often a big salad stuffed with whatever vegetables I have to hand, plus some protein. For example one handful peppers, one handful celery, one handful tomatoes, one handful cucumber, two handfuls lettuce, one handful spinach leaves. I try to use lots of different veg to get a good mix, things like beetroot, radishes, mushrooms,, sugar snap peas, mange tout, etc. I just put it in there raw.
Dinner will be curry or chilli or pasta sauce or a roast chicken or whatever. I will have a big portion (at least 4 handfuls) of vegetables with it, whatever goes with the dinner. Roasted cauliflower and broccoli with the curry, avocado, tomato, cucumber and lemon salad with the chilli, fried courgette and chilli with the pasta sauce, carrots and peas with the chicken, etc etc. In the summer we often eat substantial salads for dinner as well, which are mostly based on veg and maybe some legumes as well.
All it takes is switching your thinking and meal planning so that vegetables are the main component, rather than just a thing you put on the side to fill out the meal.