I have installed custom or after market firmwares, such as DDWRT on to Linksys wifi routers before. So I am hoping it is similar.

I just do not like the thought of paying $400 for a phone then bricking it....

And many thanks for the link to the pdf document. I have saved it to my PC and have started reading.

Question: Can I do a dual boot of Android and Sailfish or will this be Sailfish only?

Eventually I would love to dump Android.