Summonig, for me, is both the easiest and hardest LD technique. Its hard, really hard, summoning something or someone, and i developed a system, which is hard at the beggining nd eaaaaasy later on
You have to summon a box, big enough to have inside what you're looking after. A box is very much easier to summon, as it has no difficult details and is very simple in form. You dont have to imagine much. A way of summoning the box is looking behind you expecting it to be there, maybe even yell @when i turn around, a box will be there@ not that easy, but not as hard as summoning something concrete.
When you have the box, just open it, if what you-re looking for aint there, close it...

and open it again, and again and again untilyou find what you're looking for. Is amazingly easy to summon weird things this way, and to see your inner summoning desires *i tend to summon microscopes- dont ask