Best Practices for Keeping Library Size Minimal

My library file sizes are getting out of control. I have multiple library's that are now over 3TB in size!
My question is, what are the best practices in keeping these to a manageable size?
I am using FCPX 10.2. I have three camera's (2x Sony Handycam PJ540 and 1x GoPro Hero 4 Black).
When I import my PJ540 videos they are imported as compressed mp4 files. I have always chosen to transcode the videos when I import them. Obviously this is why my library sizes are getting out of hand. How do people deal with this? Do they simply import the videos and choose not to transcode them and only transcode them when they need to work on them? Do they leave the files compressed and work with them that way and then transcoding happens when exporting your final project?
How do you deal with this?
As for getting my existing library sizes down, should I just "show package contents" of my library's and start deleting the transcoded versions or is there a safer way to do this within FCPX?
Thank you in advance for you help.

No. Video isn't compressed like compressing a document. When you compress a document you're just packing the data more tightly. When you compress video you do it basically by throwing information away. Once a video file is compressed, and all video files are heavily compressed in the camera, that's not recoverable. That information is gone. The best you can do is make it into a format that while not deteriorate further as the file is recompressed. Every time you compress a file, especially to heavily compressed formats, more and more information is discarded. The more you do this the worse the image gets. Transcoding converts the media to a high resolution, high data rate format that can be manipulated considerably without loss, and go through multiple generations without loss. You can't go to second generation H.264 MPEG-4 without discernible loss in quality.

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