It depends on the venue and the type of concert. A symphony? They will have assigned seating and ushers to show you to your seat. A band at a pub? Same as finding a seat at a pub. Cochella? Probably a lot more difficult. Most venues are going to be somewhere in between. For example, at general seating shows there may still be reserved accessible seating. Another issue is restrooms and food/drinks. Locating and accessing these can be a challenge at some events.

I have friends who regularly go to live music shows independently without any assistance. The most important thing is that if you don't know the venue call them during the day usually a few days before. They will be able to tell you how the seating works, if they would be able to provide anyone to help your find your/a seat, if there are any particular obstacles for navigation, etc. Venues are generally extremely helpful and can be quite accommodating, but you have to call ahead of time to ask your questions. If you show up unannounced at an unfamiliar venue they will probably not be much help.

I would encourage you to go for it unless it is something really wild like an Insane Clown Posse show. Once you have seen one show at a venue you will be a lot better prepared and confident for future shows as the same venue and going to a show alone in general.

I went to see Eminem in 2014 was cool near the front made friends w/ 2 french girls i was standing in front of, I'm quite tall so they couldn't see so I offered if they wanted to go in front of me so they did later got their Facebook.

Was a good night (° ͡ ͜ ͡ʖ ͡ °)

Haven't been all by myself but went to an Andrea Bocelli concert this week.
They had people help you find your seat so it would have been easy even by myself.