Is playing repertoire above your level always bad?

Ive been playing for one year and four months, yet here I am... playing the 4th movement of Tchakovsky's 4th

I don't really have a choice, that's the repertoire, so my question is... Is this a reasonable Challenge? Is playing repertoire this hard so soon going to make me build bad habits? ;-;

Also the concert is in two weeks and we just got the music last week haha