I will admit the 3800s are better than LXs motors in ANY body lol, but they are not the easiest I've ever done. PITA the first time, defintely recomment ratcheting the motor forward, 2 bolts for the dogbonesand hook and pull and you get an extra 6" of space for your arms. I'm not small at 225lbs and I will pull it forward and sit up on the radiatior support and go to town on the plugs.
I do suggest when the wires break on the back, a pair of long vice grips, or long handled channel locks. Clip onto the metal piece and wedge against the valve covers and they pop right off everytime. Then for the 02 sensor plug, a socket on first and then a short extension and it'll pop right off. Its a tight fit and the socket will sit next to the sensor, extension will be against the sensor, but it will work. Be careful putting the plug back in, I've cracked them by over torquing again the sensor, so be gentle. But it is do-able, just a pain the first time.
Just remember gloves, lots of things to bust knuckles on back there and you will thank me when you slip and don't cut yourself.
Just ratchet the motor forward some if your having probelms, it makes a world of difference. I hook to the alternator brace at the bolt, across to one of the holes in the radiator support and give a good pull after unbolting the dog bones.