Learn English – Idiom for preparing very very thoroughly. ( take a lot of stuff for doing smth)

Some options from a thesaurus (some better than others): peanuts, crumbs, chicken feed, chump change, nickels and dimes, pittance, small potatoes, scraps, drop in the ocean, trifle.

Of these, "peanuts" and "small potatoes" are probably the ones closest to appropriate in your sentences.

This is attributed to Voltaire as ‘Le mieux est l'ennemi du bien’, and occurs in English as 'The best is the enemy of the good.'

However, there appears to be a preference for ‘The perfect is the enemy of the good’ in American English. Of the 36 records of ‘the enemy of the good’ in the Corpus of Contemporary American English, 22 are preceded by ‘the perfect’ (and, in one instance, ‘perfection’). 10 are preceded by ‘the best’ and 4 by ‘the better’. All four records in the British National Corpus are preceded by ‘the best’. It may be that the expression arose independently in the United States, but that in the UK it was a conscious translation of the French.