I fly regularly to Bratislva where my DS lives, mainly on rynanair, I weigh everything as far as possible as cannot lift case to weigh that once full! My first experience in November 2012, soon after my DH died, was paying £100 excess as I had booked 15kilo, case weighed 20! I just paid it as had too much else on my mind.
I learnt from that experience and book 20kg out and 15kg back, leave toiletries out there, I still hate the packing through, my husband never packed a case,. Always telling me not to take too much! Then would ask for items I had not taken!!
Since my husband died I have travelled, mostly alone, on more than 25 trips mostly to bratislava, but I still hate the packing, am relieved once checked in. I am now 76 and always arrange special assistance at airports, this is a brilliant service as the walk tihe gate is beyond me now.