can't remember password. is it safe to factory reset with root?

hello, i fkd up. i was trying trigger app plugin with lockscreen options, setup to lockscreen, put a password (that i remember) and started the action. problem is, the pwd i just entered was not the one my phone is asking me. and i have no idea what the password may be ( i used some time ago lockscreen password just to try it out and disabled it immediately)

i'm on samsung s3 neo 4.4.2 rooted, no custom recovery or anything else.

now. i'm trying every password that comes to my mind but i can't unlock it.
lockscreen is stock android, and i can't get past it.

i tryed google android device manager but it says it wont change password because a lockscreen is already there...
i also tried with my avg account but it didn't affect the lockscreen pass as expected.
i can't use samsung device finder because i don't have an updated account and i disabled samsung apps on my phone.

i'm reading that a stock factory reset with root may be bad. is it true?

so what can i do?

i found some solutions but most of them need usb debugging. and i can't unable it.

can i install a custom recovery? i tried installing cwm http://ift.tt/1Ww94u4 (with odin but the installation failed (dunno if i did something wrong)

what are my options? besides buying a new phone...

thanks

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