Getting onto a motorway from a slip road

I have passed my driving three months ago and I'm now planning to go on a short trip using the motorway. I know slip roads are there to gain appropriate speed before joining a motorway's left hand lane....

What should we do if we break down in the live lane of a Smart motorway?

What should we do if we break down in the live lane of a Smart motorway? Should we ring 999, for example?

Should you give way on a slip road?

Surely on a slip road one should give way to a lane they want to enter? Braking for a vehicle wanting to join could cause an accident. One has to be aware what is legal as well as sensible.