^If you've never replaced the motor mount and you have more than 70k miles, I would replace it while you are in there. You will already be halfway there, and if you buy the insert and press it into the existing mount isn't not a very expensive replacement.
As mentioned be mindful of stressing the radiator hoses when you lower the engine, I would be careful if you plan on lowering it more than 3". I supported the engine with a large scissor jack topped with a 2x4 to make sure there was not too much pressure anywhere. I would highly recommend a scissor jack, I felt that it gave me a lot more control to make small height adjustments, which was helpful when reinstalling the motor mount bolts.
Best of luck!
