I would do everything you can to get a blind, either build one or get a cheap one. I killed my P&Y goat outta a cheap outhouse style blind thatI set up only hrs before... I think you get get a basic blind pretty cheap online these days or for walmart/dicksportinggoods...

You can try spot and stalk, but its like catching a fly in your hands... sometimes its works, but most of the time you spend a lot of energy and come up empty handed