Flexi hoses under kitchen sink

Forgive the basic question but I want to check I'm doing this absolutely right.

I want to temporarily completely remove the kitchen sink (which wasn't fitted correctly by others) so I can seal/treat the wood worktop and make adjustments for the under counter clips.

To get to the point, I'm wondering what size spanners I need and where exactly I should be breaking the link in the water pipes so to speak.

Should I be undoing at point 1, 2 or 3 in the photo? Obviously not 4 unless I want to take a shower at the same time. I imagine 1 is best?

I've only got a limited selection of open ended spanners. The nut at point 1 is smaller than the other 3. My 19mm spanner is too small for that, but 22mm is too big for it and also too small for the other 3 points.

Am I right in saying I need 20mm and 24mm spanners?

Thanks in advance

You need spanners to fit at points 1 and 2. You'll be holding 1 still and winding 2 anticlockwise (looking from below).
Your best weapons will be a set of mole grips and a set of water pump pliers.

Thanks for your reply. I do have a set of mole grips but was erring on the side of using spanners as I'm conscious that if grips slip it could round off the nut

You can buy rather lovely pipe spanners (like these https://www.toolstation.com/split-ring-compression-fitting-spanner/p23418 but for a one-off an adjustable and the mole grips will be fine. Lock the mole grips good and hard and they won't slip (probably will mark the nut but meh)

Mission accomplished, cheers.