Tie a solid knot and have your drag right. You will be fine. I fish with 8lb FC all the time and have caught LB over 5lbs with it on several occasions. No issues.
Now, you cant horse a big fish in like braid but you will get more opportunities to catch them IMO. Just be wary of heavy cover if a fish goes for it. I hooked a solid 5lb LB about a month ago on 8LB FC and he went for a log that was at the shore I was fishing from. I knew I couldn't yank him out of there but I was firm in my resistance and was aware that might happen when the fish got close to me on the bank.
Edit: Also, buy quality line