A Word of Advice

[Elouan Sheldon]

I suggest that you save a version of your file before you try to symmetrize everything –particularly for this step, but the arm and the leg could probably use the same precaution. Multiple times now, symmetrizing has revealed that I made some naming errors in my rig. If all your .L’s or .R’s are not in the correct place, symmetrizing will produce a right mess. It’s quite noticeable if you go into pose mode as it will likely cause your mesh to explode into some undesirable shapes. Having a non-symmetrized backup saved makes it easier to correct any problems. Trying to re-symmetrize over incorrectly named piece(s) can make things even messier, I have found. I just wanted to throw that out there since this part of the rig can be headache-inducing, and it’s always nice if we can avoid making it worse haha

[Wayne Dixon]

Having backups is always a good idea. Incremental saves for the win!

You can also hit Ctrl Z when you see things go astray.
Often it’s easier to undo, fix the error(s) and then try again.

This can be easier to fix before than trying to fix the issue after – if  you know what I mean.

[Panus Boonyok]

Actually ,I don’t advise you using Symmetrizing , it usually breaks model or make some parts of them breaks in term of both model and topology , Mirror modifier is much more better and effective , try to modeling while using mirror modifier is much more wiser and better.

[Dwayne Savage]

@zenogias First, mesh symmetrize works great as long as you have your mesh positioned correctly along the local origin. You may be thinking of the Topology Mirroring. Sometimes referred to as X symmetry. Mirror modifier is definingly better in my opinion. Second, This post is about Armatures, which don’t have modifiers. It’s X-Axis mirror can be buggy too, but the Symmetrize option under armature/right click context menu work great as long as you have the bones named correctly and positioned properly along the local Y axis.  

[Wayne Dixon]

@zenogias – we are talking about Symmetrizing bones (not a mesh)

Symmetrizing is 100% the way to go!
The alternative is doing everything manually…twice…and hoping that you didn’t make any mistakes…….twice.

[Panus Boonyok]

Oh ,I am sorry ,I thought he mention about mesh.

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