I finally managed to print some very nice labels using the "All my labels" label.
I selected the style of label and filled in the details.
Then right clicked on 'finished' design and selected 'copy'
Opened up my saved word template document (I always use same one for all my own labels - it's an A4 page of 21 labels). and pasted the label into a blank space on template, where the 'All my labels' finished label appears.
Then you click on the copied label and the borders and handles appear around it, click format in toolbar, then picture and you get a box which allows you to resize it etc.
I use the box which says 'in line with text' as it seems to work for me and the size is around 3.15 x 5.05 and 84% ratio. I know it sounds complicated but it actually only takes a couple of minutes to set up once you get the first one right.
Once I get the first one complete to fit my label etc I just copy and paste it across the template and do a save as.....Raspberry jam label or whatever.
Just a quick note - I normally print it out onto a blank piece of A4 paper when I have just got the one label completed just to check it fits onto the label sheet nicely. If you are using the Avery A4 self adhesive labels you can hold the two sheets up to the light and see if the label is sitting inside the label perfectly before you print them out.
Hope this helps - I'm sorry if it sounds messy, I promise it isn't! I'll try to find a way to post a picture if I can.