Hanging in!

After having only invested in blue chip stocks, I started losing money on all of them and getting measly dividends, feeling frustrated I sold one of my parcels and bought into 1pg as my first spec stock, i have been holding 1pg since last year, I made all my lost money back and now have a hefty profit and was very exciting, now I am hooked, since that buy I think I get the buying part, I have sold all my other stocks and have started investing in other spec stocks RFN ISX NTC, I have been making profits on all of them, I think the thing that will be a big hiccup for me is when to sell as that is were I have no experience, don't want to live with any regret especially with 1-page, my initial thinking was 1pg could go to $10, do I need to lock in profits (such as the amount I initially invested) any tips some more experienced traders could give me would be great.