During lockdown but not any more.
I got good at them in the end and had a method that worked well if anyone can be bothered to read it.
first you separate the edges and put to one side
then with what remains you lay them all out face up, then separate into multiple trays. Go by color and areas of the picture etc.
this is the key, the better you separate and organise them at this stage, the easier it will be.
start building the edge, put the 4 corners at the correct distance ( says the size of the jigsaw on the box )
then build all the edge, if you get stuck then separate into shapes in lines in front of you and only certain lines can possibly fit so simply try all those and see what fits properly. You may need to adjust as you go if any were wrong.
then after you have the edge, start from the easiest part of the jigsaw and find it in the trays.
keep doing the easiest parts of the jigsaw all the way up to the end.
near the end you will should be left with all the very hard parts but now you will only have a small amount of pieces to work with so separate into shapes, making lines in front of you.
if it is a blank sky or whatever then you may need to just try every shape that can fit existing parts of the jigsaw that you have already done.
usually there is a slight shading differences so try to do the jigsaw near a window, natural light helps a lot with very hard parts.