Thank you for this tutorial. Should I cut the selvages off the fabric before beginning? Also do you hang the fabric for a time before completing the header?
This is covered in STEP 6 where we press the fabric before cutting and how we deal with the selvedge is in the STEP 6 videos when we join the fabric.
How much narrower is the lining than the curtain panel?
This is covered in STEP 7 when you join the fabric panel to the lining
panel. You trim the lining (or sometimes the fabric) so the lining panel
is 10cm narrower than the fabric panel (the lining sits in 5cm from
each fabric side when laying on top of the fabric, before the fabric and
lining side turns are made)
Is it ok to press a 1.5cm lining seam to one side and stitch them down, 1cm from the joining seam so the seams lie nice and flat. I make all my curtains this way.
Yes you can do that (we do it with blackout lining)
When the curtain fabric has a pattern and is not see through I iron the lining seams to one side and then top stitch them approx. 1cm from the first seam, which is similar to a flat felled seam, instead of having open seams. Is that ok to do? It works really well, especially on large curtains. It looks neat and seams sit nice and flat.
Yes you can do that (sounds good). We've never had problems with open seams on cotton linings though.