I agree with Hardcory, being properly warmed up and loose lets me get heavier in poundage.
In regards to exercises, sorry if this isn't helpful, but squatting frequently I found was key to getting stronger and more confident (such as 3 to 4 times per week). I don't really do accessory exercises except dragging a tire.
James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano