A. Become invisible
B. Kill a small plant
C. Remotely view something behind a solid wall
D. Divine a major, world news headline
E. Start a fire
F. Fill an empty container with water
G. Cure someone else of a headache
I’ve done B, C, D and (accidentally) E and the rest I never even thought about - it’s not so much the end result that’s difficult, but working on the skills that will get you there is where you have to make decisions and put the work in.
There are different methods to get the same goal - for example, taking D. Divine a major world news headline, I was told about the upcoming market crash of 2008 when I was asking an unrelated question about the future during an evocation (I was worried Bush would invade or attack Iran in around '06 or '07, and was told the crash would happen and change the direction of world affairs - including making another war prohibitively costly at that point).
If I’d developed major skills in Tarot, for example, which I’m still only a novice with, and had I then done a reading to look into investment strategies, I’d have had the same answer but with completely different roots and via a different method.
So those examples, they could be easy using some methods and harder using others, but the work you’d need to put in to master those methods is seperate issue.
As for becoming invisible, I don’t know where you live but in England people in high-vis outfits and the type of clothes construction workers wear are usually invisible, as in allowed to pass unchallenged and no-one really notices them, especially if they’re carrying a clipboard packed with paper, covered in logos of construction companies, and talking on a mobile phone, so (I’m being serious) invisibility is context specific and can be achieved without necessarily becoming completely transparent, which is a different thing.