remove the head as per guide, you will need a valve spring compressor to remove the springs, number absoloutly everything coming off especially cam caps valves and springs, before removing the cams i would suggest making where the teeth on the cams meet with tipex. if you have standard head bolts you will need an m9 multipline tool and if replacing with arp bolts will need an m10 as for stem seals i would get in touch with zisco for some uprated ones