Is it necessary or not?
No, if you think other people's first impressions of you don't matter!
Did anyone notice your new hair?
Of course there will be a few people but that number will be more, if you don't have hair.
Is it difficult to use?
It's not easy to do anything for the first time, except for hair.
Is it expensive?
Too expensive if you don't need to use your looks to make money, or make some friends.