You can do everything yourself if you have a team! Yet, no marketing skills or no marketing budget = no crowd and no crowed = no ico success. Hiring helpers here is not a bad thing.. don´t see it as full outsourcing...see it as your support!
Good luck with your ico!
Here are some tips for starting an ico (made by community members)
https://bitcointalk.org/index.php?topic=2131560.120Thank you for your advices, especially the link to the marketing topic is very useful!