I've always been working in journalism, but now I want to switch to public relations field,?

and now I'm job searching. The problem is, good computer skills and good PR writing skills are vital criteria in PR, but I lack of both knowledge. Do you think I should spend a month or more in training up those skills before applying jobs or get the training and job appyling both doing the same time?? At the momment I'm quite frustrated because I'm pretty bad on those two skills!!!