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Hi Marko, and welcome!
Firstly, NGC5139 is a very easy binocular target, even in relatively light polluted skies-it should show as a fairly large white smudge in your binos, so I would suggest you are not looking in exactly the right area. I do not use a chair or tripod with my 10x50s, but you may be better off with a tripod with your 15x63s.
As far as safety is concerned, I personally would not go alone to any remote or lonely spot.
I think it would be a good idea to join a club-you not only get to use a dark location, but you have the company of other amateurs who can help you to locate astronomical objects and you also get to look through many different sizes and types of telescopes.
Cheers
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