As to your question about how big of a deal is it to pull an engine. It is work. I have pulled two using stands and a crane in my drive way. To the guys that can do it in a couple of hours, my hats off to you. It takes me a good part of the weekend to get it out.
It takes me a major part of a weekend to get it back in. I find the re-assemble process takes longer because of the need to torque bolts and I tend to work slower to be through.
As for tricks/tips. Get the car as high as possible on the stands. This makes it a lot easier to get in/out from under the car during the operation. Hence the reason for the longer boom on the crane.
Have a good buddy to help. It really isn't safe by your self (yes I know there are some out there that do it, IMO they are taking a chance). I do all of the prep work by myself. My Son helps me actually crane the motor in/out.
The top bolt of the starter is a real PIA. What works best for me is a 13MM flex socket and a very long extension. Access via the front through the K-member. The same 13MM flex socket will help with the two top bolts on the engine/transmission.
I do the engine/transmission separately (I know that many do them together). If done separately, get a screw style jack to support the transmission. Do not let it hang on the mounts. Same thing applies to the motor.
It is also possible to support the transmission with a piece of pipe between the frame rails.
For an automatic transmission, the engine will be easier to remove if the transmission mount is loosened and the transmission is slid back. Helps even more putting it back together.
If you ever had any thoughts about a tubular K-member, there is never a better time to install one than when the motor is out.
Plan on which sensors and gaskets are going to be replaced during the work. I always replace the oil pan gasket simply because I hate cars that leak oil on the garage floor. Not to mention it is so easy on the stand. Clean the oil pick up screen.
New front O2 sensors are a good idea if high mileage (100K+).
Motor mounts should be looked at closely. Especially if high mileage.
Consider having the fuel injectors cleaned and flow tested. See
Ultrasonic Fuel Injector Cleaning and Flow Testing for an example. Will be as good as new and give you the piece of mind at the same time.
When removing the engine, double check to be certain all wires have been removed. Lift a little and then re-check.
Upon installation, look for pinched wiring. During my first engine pull the O2 pig tale got crushed between the engine and transmission. Two days of diagnostic and repair work followed.
Did I mention to take pictures? Pictures will really help to get the wires routed correctly.
It is a lot of work while you are doing it. Afterwards, there is a real feeling of pride for a hard job completed. Good luck.