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Rob,
Hello and welcome to the learning curve. It's all pretty easy once you get the hang of it.
First thing I would do is ditch the diagonal, it just complicates things at the moment. That means everything will be upside down and back to front but that doesn't matter. Use the eyepiece with the largest number (ie lowest magnification and widest field of view), which I think will be the 20mm (btw is it a H-20 ?). Now point the scope at something you can't miss and, with your eye about 10mm (give or take a bit) from the eyepiece, adjust the focus. If the object is too close you won't achieve focus but you should at least see that something is there. If you can use an object a few hundred metres away, or further, you should get focus. (I use the Illawarra escarpment which is about 1km from me)
Move the scope until it is centred on some distinctive point, such as a tree, tower, antenna etc (I use the TV tower on the escarpment) and lock it there. Now look through the finder. Adjust the focus and use the alignment-adjusting screws to move the finder until its cross-hairs also point to the object in the main scope. You are now ready for your first look at the moon!
Let us know how you get on.
Edit: Correction - I should have said to ditch the correct-image diagonal. Just use a 90 degree diagonal if you need the extra path length.
Last edited by AstralTraveller; 10-01-2017 at 01:54 PM.
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