Yechiel Michel Epstein,
Translation:Arukh ha-Shulchan…
“ Since the basic permit to believe a single witness by slaughter (‘shechita’) is because he can repair the matter himself, why would a person who is not a shochet be believed - even on his own animal – to say it was slaughtered properly simply because it is ‘in his hand’ to repair the matter by asking an expert shochet to do it? Why wouldn’t we say “who knows if he has found the expert he seeks?”, much like the Gemara in Shabbos 46.2 that states in regard to hiring an expert to determine if one’s firstborn animal has a blemish: “Who says he has met a qualified expert?” ”
