Covering your tracks and proxies

So, I'm trying to understand how much I need to "cover my tracks" when making backlinks/promoting my site. I understand that I should use proxies, but how many should I use? For instance, if I'm making my first PBN and I create 10 web 2.0s, would I need 11 proxies? (one for my main site and 10 for each of the web 2.0s), or would it be safe to handle a large number of sites on a single proxy?

Also, If I'm doing any sort of manual marketing (posting links on blogs, articles, etc) would I need a proxy?

Thank you,

You won't really need to hide your ip from the Web 2.0 properties--until you make too many accounts/ip and they ban it. Google has no idea that you used the same ip to sign up for 10 weebly accounts...Unless it's owned by Google.

What you should be more concerned about are foot prints. Like using the same email address in the contact form. Having same content word counts, pages, etc. Just mix it up so they aren't so obvious they were made by 1 person.

Ah ok, is there a rough estimation of when it gets in the "ban" range for accounts/ip? Also, does banning an IP just mean I wouldn't be able to sign up with a particular web 2.0 with my IP, but I would be able to sign up if I use a proxy?

10-15 web 2.0s should be good for 1 ip. Just don't make too many blogger