A question was asked about how to get the engine out and how high the car has to be. I just use cheap Harbor Freight jacks and jackstands. I'd love a scissor lift or
QuickJack.
Here's my answer to how I did it this time:
To get the engine out, I just used jack stands on top of concrete blocks (laying on their side). The front wheels were on "Rhino ramps". For a jack, I use a "Pittsburgh Automotive 3 Ton Heavy Duty Ultra Low Profile Steel Floor Jack" from Harbor Freight for about $79.
I lowered the engine and transmission together with the jack under transmission and an "ATV Lift" under the engine. Use a couple blocks of wood for padding or to fill space.
After it's lowered on the jack, I get it off the jack onto a sheet of cardboard or plywood, then slide it out on the floor. I usually have to rotate the engine to get it past the suspension support.
I don't have an exact height. "As high as my jack can get it" is what I use. Higher is better. Always have another support in place to prevent the car from falling more than a couple inches.
A good alternative method is to drop the rear suspension with the engine and transmission. I have done that too. Here's a post with pics of that being done on Tom Stone's car:
Spec Boxster Build