Mark.
re doing vocals.

even big name vocalists are helped along by studio "tricks" and engineering.
which is why when one hears a band live they sometimes "dont sound like the hit record."

i sincerely hope the following little tricks help you in your quest.
1. confidence is a VERY big thing. say to yourself "i can do it".
breath in measured amounts matching the song phraseing.
get one phrase right at a time. before going on to the next phrase. ie bite sized chunks.
2. try different "personas". for example recently i was doing a song with a normal vocal persona.
it wasnt working. so i tried a "evil persona", and suddenly the song came alive.
i n summary experiment with different personalities. if a loud voc isnt working try a whispery vocal.
then try subtle stuff like a whisper behind a louder vocal.
3. doubling vocs i mentioned. the beauty of doubles is they add vocal "character" and charm.
just listen to major hits , and doubles are used in lots of songs.
try and mix it up. maybe a simple voc for verse, but doubles or even triples for choruses.

sorry mark my time is limited, i am recovering/tired from a minor medical procedure this evening.
for further info there is lots of vocal info/triks on the net. also spend time carefully listening to hit records.
cos you can pick up lots of ideas.

just trying to help you a little, and god bless.
i wish you every success with your songs.
om

my songs....mixed for good earbuds...(fyi..my vocs on all songs..)
https://soundcloud.com/alfsongs
(90 songs created useing bb/rb)
(lots of tips of mine in pg tips forum.)