Hmmm. Seems my replay was not #2 when I wrote it, else I would not have refereed to "guys". Apparently some were retracted.
Anyway, I stand by my answer as the neatest way to do it - for an experienced engineer.
If you are fussy about working with mains, then yes, a plug pack is the way to go.
Of course, it must be a reputable brand, as the "cheapies" from China have a bad reputation. I acquire what appear to be genuine ones (that came with the phone) at Garage Sales, never for more than $1.
And -
this was recently posted on another thread.