Optimistic =  hopeless/pessimistic/discouraging

Success = failure/flop/catastrophe

Hard = heavily/seriously/arduously/laboriously

guidelines = principles/rules/advices/directions

Understand = perceive/comprehend/realize/know

important = insignificant/unimportant/minor/trivial/silly/ negligible

diligent = industrious/persevering/laborious

rely = depend/lean/count

honestly = dishonesty/fraudulency/deception/fraud/duplicity

help = Hinder/obstruct/hamper/prevent/interfere

Peak = zenith/acme/top/apex/summit/pinnacle

harbour = anchor/hold/cherish/believe

laborious = lazy/indolent/idle/lethargic/sluggish/inert 

Shine = prosper/flourish/thrive/succeed