The issues you mention are mostly the trading platform dependent. When you are choosing a reputed trading platform, you will not face any issues.
Not in bitcoin trading, but in my Forex trading I have faced the many issues like order is not getting executed and not connecting to live market are some of major issues, I have faced in my trading.
Then you can start your trading with the localbitcoins.com right. only you pay for payment charge for site and easily find good trader around there and please try to have good trading techniques to have a perfect trade.
There are to many people with the trading problems i think when you dont know allot about the bitcoin you can better quit with the trades becuase yyou are a big risk
for the bitcoin you know.