OMG! i need help plz

so my brakes went out yesterday and we found a leak it was the wheel cylander so i replaced it this morning and took the car around the block there was tons of air in the lines took like 6 pumps to make them solid and my dad said i need to bleed the brakes but those things are on there tighyt vicegrips wont lock on it and my dad said i have to be careful with them if they brake i get to get a new wheel cylander is there a way thats good to get these loose and what size is it?
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