Having done it myself a few times, it really is super important to get any high/low spots out of the underlying concrete, otherwise as you walk around the room you’ll feel the laminate sink under your feet in certain areas and maybe hear the air being pushed out through the underlayment. Feckin devastating after you put so much time into laying the wood.
I’d also second removing the skirting and undercutting the architrave around doors to let the floor in under it, rather than using beading.
Whether it’s something you can do yourself will probably depend on how bad the concrete is. I watched all the afore mentioned YouTube videos (very important because the compound goes hard very quickly!) and did a couple of rooms, just filling low spots with levelling compound, worked well, but if you find you need to lower areas of concrete or anything like that it may be worth saving the heartache and getting somebody in to do it.