If you have a helping hand, they aren't hard to install.
etrailer.com has some good videos on how to measure to get the right length, how to install etc..
I purchased mine from etrailer and highly recommend them. Had one with shipping damage. Took pic and they sent a new one right away.
As far as installs, agree with fj12ryder... look around for an independent RV repair shop, or a mobile rv repair.
It took me about half a day to install 4.
Mike
Im Mike Willoughby, and I approve this message.
2017 Ram 3500 CTD (aka FRAM)
2019 GrandDesign Reflection 367BHS