HI
listen sky 738 in the good old USA, ceiling is not req'd. I still remember when it changed. IT USE to be that you needed 200 and 1/2, but they finally changed it to just the 1/2 (or RVR equiv as published for the apch)>
and you mention the IAF. MOST people reference the FAF, which as you all know is the lowest published glideslope interception altitude (usually just outside the outer marker. Do not get the maltese cross symbol for the non precision localizer only apch confused with the FAF for the ILS.
So, the IAF is really not too important, the FAF is.
Do tell us if you are part 91 or part 121 or others.