on a shoestring

(informal) to be expensive, cost an arm and a leg

(informal) to tie oneself in knots, to worry oneself sick

(figuratively) to chase rainbows, to build castles in the air (to make overly ambitious plans)

(rare) head to toe

I'm sure you'll like it! You won't regret it!

(informal) I'm sure you'll like it! You won't regret it!

(informal) to go through hell, to suffer, to have a hard time, to have a rough time of it; to go through the mill (with a purpose)

(informal, figuratively) to have no flies on one, to be pretty good, to be quite something, to be excellent

Alternative form of avoir des étoiles dans les yeux