Thanks for those who replied. My kitchen is on the rear of the large slide drivers side.
I took apart the inside of Cabinet under the sink. After that I had to cut the hole you see. Its about 12 in square. Unfortunately the support for wall and junction boxes ran right through the middle. I had to lie on my right side and snake my whole left hand up through the opening.
The worst part was the hot water supply 90 degree faster cracked after I put the new fawcett in.
After some running around, I found a Flair-it fitting with 90 degree angle. I tried to find a pex pipe expander. Not going to that trouble or expense, I found a tool kit for repair irrigation systems, $13.
It took me 2 days to do this. Where I originally took it to be replaced, told me they couldn't find the access. These are experienced people over 25 years, I use them in Tucson every year.
I feel they could have done it, they didn't want to.
I still have to put everything together, going to take a shower first togive it a test run.