I was born in Norh Devon and therefore learned to talk surrounded by that very unique local accent before my family moved to Bristol when I was approximately three and a half years old. Bristol also has its own unique accent, and therefore throughout my life I have always possessed a very pronounced West Country Drawl.
I have never found the above to be any disadvantage as almost all the people I meet seem to find it a very friendly accent, and it can become a topic of conversation when meeting someone for the first time.
I was an HGV driver in my younger years where I was always meeting new people while carrying out deliveries. That was the first time I felt my strong West Country drawl to be a great help in dealing with persons. Later in the role of an industrial safety officer, I felt it was an advantage while training distribution Centre shop floor manual workers who because of my accent seemed not to view me as "one of the suits" from Head Office who they so often despised.
In 2003 when my wife and I opened our current business in the same industry, three of our major customers were all based in the City of London. That brought me into contact with many who were from high education backgrounds, but once again, I believe my accent was (and has been since) an asset to my involvement with those people. Undoubtedly I come across as someone who has shop floor experience in my background and often that is what is required with Industrial Safety.
Again undoubtedly, there are times when I first engage in conversation with someone they think to themselves "carrot cruncher", but often that impression is dispelled I believe after a few more minutes of conversation.
So, having a thick local accent has never been a drawback but certainly an asset to me I feel. I could not hide my own even if I tried, and I love to hear local accents in others.