好高务远

idiom

to aim too high; to bite off more than one can chew; to crave for things beyond one's reach

Used to criticize someone who has grandiose ambitions but lacks the practical ability or willingness to start with the basics. Almost exclusively used in a derogatory sense. Has the same meaning and usage as '好高骛远'. The original phrase uses '骛', while this version uses the homophonic '务', but they are interchangeable in this idiom.