First the safety disclaimer. Be careful. This work is dangerous. I've done mine twice and my neighbors truck once. There are many aspects that could potentially get one hurt or even killed.
Where do you find the 1" spacers and how hard is it to change out the springs?
Got my 1" spacers from ICON Vehicle Dynamics. They refer to them as TEI spacers. Many companies offer them. I think they are better than the bigger rubber "hockey pucks" that some put on top of the coils to level the truck.
The front coils are pretty easy to change on these trucks. I would say 1.5 to 2 hours tops - including one beer - and you will be done
1) jack up the front of truck and put jack stands under both frame rails just rearward of where the control arms connect to the frame.
2) Put a floor jack under the front axle just to support it.
3) Remove front tires and wheels.
4) Remove lower shock bolts on both sides
5) Remove either the upper or lower (your choice) sway bar link bolt on both sides.
6) Disconnect the wheel speed senor wire bracket from front of lower coil spring mount (known as the TEI bracket). One 10MM bolt per side.
7) Lower floor jack and allow one end of front axle to drop slowly until either of the front springs looks like it's about to fall out.
8) Wrestle the spring out, and wrestle the new one in. Be sure to "index" the lower part of the spring into the TEI bracket. Repeat the process on the other side.
9) Undo the first 7 steps in reverse order.
If you are installing TEI spacers at the same time as new springs, they would be step 7.5: "Remove single bolt holding each TEI bracket to the axle. Insert spacer and reinstall TEI bracket with new longer bolt provided with spacer".
That's all there is to it. Just need a good floor jack and some stout jack stands.
Remember that these trucks are heavy. I recently rolled my front axle on a scale while leaving the landfill and it was 6,400LBs. Entire truck weighed-in at 8,600LBs. You cant just use a jack and stands designed for a Prius.