Check with a local suspension expert for what spring rates you'd need. With me I just needed a shock spring, the forks were fine. While I was waiting for the spring to come over from the States, I rode the bike as it was (gold-valves in the forks), and all I can say is, I was thrilled with the spring turned up. When my husband was riding my bike for a couple of weeks, he left the softer spring in, just adjusted the sag/preload/whatever, rather than putting in the stock spring.
I'm 5'3", 110-120lbs?, spodely rider, riding sandy forests, so was advised on a 4.4kg spring (stock is 5.0kg). That balances the stock fork springs.
Hope that helps some, and no springs aren't that expensive or hard to change (oops sorry, can't say about the forks as haven't changed them).