How hard it is to replace the rca input on the shindo amplifier?

Yes, I picked it up at a local electronics store near my house. I spent around $130 for the wes51, one extra iron tip, and a small can of flux. 
Thank you.
Calvin

I’m glad that actually you chose the path of learning instead of hiring someone for insubstantial problem. I know many today’s audiophiles even refuse to learn to work on elementary items, but not this time indeed. The phrase on each today’s electronic component "Only for qualified technician" appeared in 90’s operation manuals instead of detailed schematics and service manuals to keep you away from learning and keep you closer to spending indeed. WES51 is very good investment for all electronic repair needs. I use one since 2002 SAME model. That tells about the undisputed quality of a tool.
Now next step you’ll be shopping for de-soldering tool I guess.

Any reccomendation on De-soldering device?

I use the electric one with sucker bulb and found it the most useful for all applications
I would probably want to use electric one with button, but 30W is insufficient most of times.
https://www.parts-express.com/cat/desoldering-tools/520

For many years I've had one of those spring loaded solder vacuuming devises ("solder sucker") where you just point it at the solder and hit the button…instantly sucks up the hot solder no problemo, weird but effective.