I am a new Phd graduate. During my Phd I mostly worked and found my research problems on my own. I managed to publish some papers with my supervisor, even though he didn'd help much. I think that is not so uncommon. Now, after graduating, I work at a university and do research again "on my own".
In my view it is alright to do reasearch independently. The feeling of making new progress and publishing a solo paper is of course great. However, everytime I put a new paper on Arxiv, I am always afraid of making a serious and stupid mistake. In the past I did encounter such an experience. Before submitting a paper to Arxiv, i didn't sleep at all. I read the paper many many times since I am scared of overlooking something. I am obsessed with it for several days even after submitting to Arxiv.
Q1. What is an usual and easy solution for this situation?
Is it common to send out my preprint to an expert (for whom I do not know before) to have a look before we publicly submit it to Arxiv?