Yes, you absolutely must come across as polished, articulate, and professional throughout your job search. However, many people translate this into: Must… Be… Boring…
Wrong! Realise that few people get hired because they had perfect white space on their cover letters, memorised all of the “correct” interview questions or used incredibly safe common clichés throughout their resumes. All of this correctness is going to make you look staged and non-genuine. Instead, be both polished and endearing. Memorable, likable candidates are almost always the ones who go the distance!
TIP – You gotta be in it to win it!