FIRST REBUILD> 225 slant six

this would be my first rebuild.. i am just wondering what all it would take to replace every gasket in the full engine gasket kit that i bought. i can borrow an engine hoist and engine stand from a friend. how long would this take me? are there any good stock builds that go step by step on here? i want to repaint and refinish everything under the hood after putting new gaskets on the entire engine. it is currently running, but not amazingly. on the cylinder side of the engine there is oil on the engine. some under 5th and 6th cylinder at head gasket and much much more around valve covers.