help with phrases

[megan1]

Can anyone help me with the following initials of familiar phrases/sayings
1) BYN out OT
2) DAN into HC
3) H your HA a BW
4) HAC up HS
Also the following initials which are from the FIRST LINE of a well known POEM or CHRISTMAS CAROL
5) W is TLI, FOC...
Many thanks

[squarebear]

3 - hit your head against a brick wall.

[teddybon]

What is this life if full of care.......(5)