When you do a dry fit..expect that the joint will be about 1/4" tighter when you actually solvent weld it. In other words, dry fit, then cut the pipe about 1/4" or even 1/2" longer. That way, you don't have to jam it in there when dry fitting.
Work from one end. Don't try to cut all the pieces first. Measure, cut, weld each piece as you go.
Unions are great for allowing you to rotate something later. If you can't get it lined up perfectly, a union can help.
When welding in an elbow, dry fit a length of pipe on the other side of the elbow so you get a really good visual of what direction the elbow is pointing.
That's my 30 second plumbing advice....
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
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