What is the best way to attach the digitizer and the LCD

HI, I ordered some replacement Digitizer screens for a couple 4th gens I had with cracked screens, I waited until the parts arrived to take them apart and found that it is best to order the compelte assembly, wich I did and all is good but no i have 2 digitizer screens sitting here. My question is if I order 2 lcd's what is the best way to attach the 2 pieces together or is it not worth attempting.

In the future I will order them complete but i would like to be able to use the parts I bought .

thanks everybody

JP