Tried this tactic out with Glasgow Rangers in 1st season, I won the quadruple of League,League cup,Scottish Cup & Europa League, So far this is easliy the best tactic I've tried for FM 18
P.S I'd post the screenshots but no Idea how lol
To do a screenshot in game, press ALT+F9.
The screenshot will save in My Documents\Sports Interactive\FM18\screenshots or something similar, unless you've changed it.
Then on the forum, click the paperclip icon, browse to the folder where your screenshot is, and it should attach it.