Run Tails and verify its checksum using multiple sources:
https://tails.boum.org/Use the TrueCrypt and Tor Bridges options; keep everything (including your TrueCrypt container) on a bootable AES drive. (Just read the Tails docuмentation.) Spoof your MAC address, use Open Source BIOS, buy your hardware anonymously from third-party sources (WalMart, Best Buy, etc.) and pay with cash only, maintain the physical security of your hardware at all times, beware of keyloggers and other hardware exploits, surf from anonymous Wi-Fi hot spots, disable all hardware options that you don't need (autoplay, FireWire, etc.), etc. Use all the available Tails options and programs, and don't have a "knee-jerk" reaction when upgrading Tails.