I am having trouble refining the attached rendering- particularly in areas such as the faucets, lighting, mirror, and countertop. No matter what I do they still seem fuzzy. I have been you-tubing etc and have made changes to materials and various other settings but I’m clearly not doing it correctly. Any advice for me? Detailed advice if possible 
Realistic doesn’t necessarily mean the same as nice.
There is something wrong with the mirrors. If the material is OK, my guess is that the faces are reversed.
The lighting is the biggest problem. The strongest light seems to be the sunlight leaking from under the door (treshold missing?) Are you really intending to light the space with three weak luminaires that resemble candles? Are they intentionally designed not to let light out?
I have recessed lighting as well along with two windows. I ‘turned off’ the lighting and have the time of day set the night. I’m focusing on the fuzzy appearance of the aspects I mentioned it looks pixelated
When it is better lit I’m still having the same issue. I fixed this by playing around with rendering settings at one point, and then lost the settings I had after changing scenes in SketchUp and have no idea where I was at after playing around for an hour
Can you share your model? Or if too big post to cloud drive like Google or Dropbox and share link here.
Have you considered less complex software (Twinmotion) or AI ?.. might be better bangs for your buck and frustration levels?
There are some problems with your render, what textures did you use? The wood and and some other textures luke like they´re just the albedo map.
Have you increased the resolution of the image? It looks as if you are simply zooming in on a small picture.