I am pretty dubious about voice coaches in toto - by and large for them the only vocal presentation is opera, and they talk a lot of mumbo-jumbo about "columns of air (huh? how much of a ceiling will that hold up?) and "sing from the stomach" (huh? 6 pints of lager and a vindaloo coming right back atcher) and "don't sing through the nose" (huh? hold your nose. now you can't sing through it, canyer? how does that sound?) Oh, yeah, and grip your hands under your bosom dear and stand up straight and sound your "t"s.

Like guitar teachers, how many will help you to do what YOU want to do, not what THEY want you to do?

Even worse, IMHO is trying to be someone else. Don't copy mannerisms at all.

Listen to yourself (don't be put off, we all hate our own voices recorded) and give what you can to the song. If you need to rest your throat the next day, do so.

Oh, and always ignore advice, particuarly from people who are worse than you. If you are singing already, that's about 99% of the world. Who am I, or who is anyone else, to tell you what to do?