I say better because perfect is for someone who drives for a living and has to back perfectly to those loading docks with semi's on either side.
What I do is assess the spot by looking for any obstacles on either side and hanging overhead. After that I lay out 4 or 5 plastic wheel chocks on the drivers side on the line I wish to follow. Very easy to open the door and see if you are on line. I always try to use mirrors, but, not always successful. I will say that back and forth across the US, I have yet to damage my unit by hitting something, and, trust me, there have been some tight, crazy places to get in or out of. Sometimes when you pull in a space, your "new" overnight neighbor changes the movement dynamic
The key as mentioned here is get out and look as often as necessary. No damage is more important than listening to well intentioned people who will "help" you park until you smack something. Then they are gone
My home spot in the mountains of GA looks EZ to back in , but, there is a huge, 2 ft high rock right in my pull up and turn radius. Soooo, I have to jump in and out several times because I cannot just pull forward and turn tighter.
I place my unit within 6 inches each time I move it. This allows me maximum space for personal use on my 60ft concrete slab. Also, no extended slide can hang over any grass area as to not impede professional mowers.