How to make a two-way piston door

Make a hole of 3 by 7 and it should be three blocks deep.

Two blocks away from the left side, arrange the quartz like this, a squashed J.

Then add three more quartz blocks in this way.

After that, you place a sticky piston in the upper right corner.

Put a quartz block over the sticky piston and a block next to it on the left.

Put a redstone repeater in this way. (I will include a photo of the whole thing so you can see where exactly later)

Next to it, turn around and place two redstone repeaters.

Turn around once again and place down a redstone repeater.

In front of the last redstone repeater, place a sticky piston, sticky side facing up, one block off the ground.

In front of the sticky piston, place a quartz block.

Put a sticky piston on the left wall on the right.

Next to it, place a redstone block. The sticky piston should be activated.

Place redstone on the quartz blocks as shown in the picture.

Place one more redstone as shown.

On the right top corner, place a quartz block there.

In front of the quartz block, place a sticky piston. After that, place a quartz block next to the original quartz block. Destroy the original block.

In front of the sticky piston that was just placed, place two iron blocks.

This is what it should look like so far.

Inside view. Tutorial will be continued.