I have had my sprinkler's off all winter due to rain, cold, etc..

Anyways, I just turned them back on. There is an area in my backyard
with five faucets with the sprinkler "boxes" hooked up to the plastic
pipes that carry water throughout the landscaping.

Anyway, I noticed that a few of the boxes were dripping water. They
weren't dripping before. I tried tightening the connections, it didn't
help much. When I tried to tighten one of the fixtures tighter, it
BROKE off (the round thingy that screws on to the timer box). I think I
can "snap" that back into place but it will be harder than hell and
I'll need some lubricant.

Anyways my question is should I call a plumber, or a handyman? Or
should I attempt to fix this myself? I should say I'm not really that
mechanically inclined, but I DO have one of those "handyman's
encyclopedia" sets in the garage that I got (AS IF I was going to
assimilate all that knowledge by ozzmosis HA!), I wonder if those can
help?

Any help appreciated. Also why did they start leaking? They weren't
leaking before. If I didn't know better I would think they were
tampered with, or something? Two other rainboxes also are leaking in
another part of the yard. I though it was a fluke at first...