Yeah, 4 pounds per gallon is pretty high, especially for your first mead. If you really wanted that much, you could look into adding it in 2 different steps. To give you a general idea, 2 pds should give you around 8% and 3 pounds around 12%. That's just a rough estimate though, depends on the honey you use. Still best to use a hydrometer of course.
Forgot to mention this earlier, it is definitely important to add nutrients to your mead. Honey is very low in nutrients that will keep your yeast healthy.
Bottled: Plain Cider, Kiwi Melomel, Mint Metheglin
Up next: Pumpkin and Nutmeg Cider, Apple Pie Cider, Blue Berry Cider