thanks alfried for getting me on the right track.
Firstly, to answer one of my original issues:
“I even chmod 777 the file and dir and still gettting the error.” This didn’t work bcuz my downloads were set to go to /home/{my_username}/Downloads/TV but /home/{my_username} dir had 700 permission, so only my user could get in there, i changed that to 750 and bcuz sonarr is in the same group as my user, it worked fine after that.
(NOTE: dont change the /home/{my_user} to 770. this will make sshing into the computer impossible (if you use keys, dunno about passwords). ssh doesnt like it if any user other than the owner of that dir to have access to the .ssh folder)
so in the end, heres my setup. my user and sonarr are in the same group that owns my /home/{my_user} directory. sonarr will tell transmission to download the files to /home/{my_username}/Downloads/TV (sonarr user will need access to TV one way or another). the renaming and file clean up works!!! yay!!
thanks guys
keep up the good work markus. if you need any help let me know!