you need a stool or a chair, if you havn't got one the right height go and get one...will save your back
..Sounds like mabye you weren't focussed properly...once focussed on the moon you shouldn't need to adjust the focus then..start with the lowest mag eyepiece(ie the highest number) and center the object..then try the next lowest number..and center again..but you may need to adjust the focus slightly when you change eyepieces..with jupiter you should see a few bright dots around it aswell..its four main moons(but sometimes 1 or more may be behind him)..don't get dissalusioned,it takes a bit of practise,,you'll get the hang of it