well IMO the best graphics programs are photoshop and paint shop pro, i used to use PSP the most, but now i prefer PS, it has much better features, although i still use PSP for some stuff
i would say if you already have PSP 8 there isn't too much point in getting another program, PSP 8 has some nice features
it may be complicated at first thought, but there are two solutions to that (i would reccommend both):
1. Find some tutorials, there are plenty out there (espically for PS)
2. Practice, as they say; practive makes perfect