I'm a brand new Ham...actually a brand new Ham-interested non-Ham as I don't take my tests for Tech and General until Monday...and I got my GT-3's yesterday.
Everything I had read indicated manually programming them...and ALL Baofengs...was a real chore because 1. The keys were so small, and 2. You had to make a single change at the time, save it, and start over.
I got the programming cable when I got my GT-3's, and downloaded Chirp to use to program the radios. All I can say si "Smooth as silk". Programming frequencies, offsets, modes, tones, etc is easy (if only I knew which of each to use....LOL...I at least got the repeaters in my county for 2m and 70cm programmed just to see how easy it was) and programming functions like squelch and default volumes, Roger beep on/off, etc is a simple matter of choosing from a list if choices for each setting.
There is one thing you need to know. Some folks think the Chirp software will not work with the GT-3 because when you choose freom dropdown lists what manufacturer and model you are programming the GT-3 is not on the list. Don't worry about that.
The interface dropdowns for Chirp have not been updated...it is, after all, free, open source software...but if you choose the Baofeng 5R it will work just fine.
Here is how to get Chirp on your computer:
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https://www.youtube.com/watch?v=chNKMlxjOr8</center>
Here is how to use Chirp to program your Baofeng GT-3 (or 5R) I DON'T KNOW WHY THIS LINE IS SHOWING AS A LINK...IT ISN'T ONE!
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https://www.youtube.com/watch?v=-cUmyElf1MI</center>