Membership subscription with Authorize.net ARB.

I see from the threads that in 2011 there was a problem with recurring billing and Authorize.net. Was this issue fixed with ARB?

I have signed up with Authorize.net as payment gateway on my membership site. I'm in the process of setting up everything.

I see on their docs that they want me to hire a web developer to do it for me. Does the membership plug-in do it when I install my Log-in ID and transaction key or will I need to get a developer?

I feel lost and unsure whether I've done the right thing signing up with Authorize.net.