The harnesk is fine, and you should be carrying a few fire potions anyway to deal with gjalls when they catch you by surprise or the terrain isnt suitable.
Atgeirs are always a good idea however. Plus building a block trainer to get your skill to 100 is recommended also. You can search "valheim blocking trainer" on youtube for a video on how to do that. NB- dont build it in the plains or a lox will stomp it flat sooner or later. Meadows is best if possible, but black forest and mountains will work too.