Service of Summons and Complaint on US Attorney, individually and on United States - how do I do it?

Just want feedback - please no snide commentary on how I should look at FRCP 4 - I have and just want support - and please don't tell me to hire an attorney - just answer the question. Ok, when suing the US Attorney individually in a Bivens action I can either: hand the summons and Complaint to him, then serve the US by certified mail at the US attorney's office and serve the Attorney General by certified mail - right; or I can hire a process server to serve the US Attorney in accordance with local law, and copy the US and the AG on same as outlined above - or I can send by certified mail the summons and complaint to the US Attorney's designated agent and repeat the steps above, right? Just asking, thanks.