Does anyone have any tips on playing with both hands?

I know what you meant about the fustration of not being able to play a piece especially when you practice all the time, I get this all the time!
The only tips I can think of is to make sure you can play each hand seperately almost perfectly before you try and play them together. Also I find writing on the music helps, like draw a line between the left and write hand notes if they're played at the same time or if one hand is played first draw a slanted line from that note to the note in the other hand that is played afterwards (hope that makes sense?). Also play it really slowly at first. Hope any of that helps :D