Mod talk:TerrariViewer/@comment-26541764-20150717032342

is outdated but still works for terraria v.1.3 but note:

1) (in my experience) you cant give yourself (or edit) weapons added after terraria v.1.2.0.3 (for example: you cannot add "North Pole" spear to your inventory cuz it was added to terraria at v1.2.2; you can give yourself "Staff of the Frost Hydra" cuz it was added at terraria v1.2. - which is 1.2.0.0. 1.2.0.0 is older than 1.2.0.3. ...get it?).

2) I reccomend to use second, disposable character to pass to yourself any item that you want-because this editor will mess up the appearence of your character when you will add item to its inventory. (or maybe it's just me doing something wrong, but unlikely.) or maybe even use second world - just in case.