If you have the courage of your convictions, you are brave enough to do what you feel is right, despite any pressure for you to do something different.
If something is to little avail, it means that, despite great efforts, something ended in failure, but taking comfort from the knowledge that nothing else could have been done to avert or avoid the result.
This means juggling too many projects at once and something's bound to fail; when a smith had too many irons in his fire, he couldn't effectively keep track of all of them.
If something is a tough nut to crack, it is difficult to find the answer or solution. When used about a person, it means that it is difficult to get them to do or allow what you want.
'Hard nut to crack' is an alternative.
If someone turns a deaf ear to you, they don't listen to you.
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