assuming it's like a 603 it's pretty easy. You just have to respect the loosening and tightening sequence of the cam towers verbatim to the FSM. You'll also have to mark the timing chain to the cam gear...nail polish works well here.

After the cam is removed it's just a matter of dropping the new lifters in. No adjustment necessary.

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)