I really don't see why some people get so would up over a wedding, or find it so stressful.
We had a reasonably large and traditional wedding. Church, 2 wedding cars, co-ordinated colours (bunting, chair covers, favours, table plan - you get the picture), 4 tier cake, bridal party, hair and make up ladies, all day affair.
I suppose it is a 'lot' to organise, but I really just don't see why some people find it so time consuming.
When we were in the 'actual' planning phase, dh and I made a list, then split it. So I had the room decorations, dresses for the girls (including me), flowers and hair/make up to organise. Dh had the cake, cars, suits. Etc. We each took our lists, spent a few hours over the space of a couple of weeks making visits to get quotes and taking pictures of the cars/flowers etc to show the other. Then we sat down one evening, spent about 2 hours going through it all and making the decisions, then an hour making phone calls and payments to book it all.
It was the same with the table plan. A friend of mine spent days doing hers and nearly drove herself to a breakdown re-doing it over and over. Dh and I had one fantastic evening where we had a competition (well was good for us to exercise our competitive sides anyway). We had a huge piece of paper each and a pack of post its. We each did separate table plans for the guests, then compared them and went through our reasoning. It took about 3 hours and 3 bottles of wine. DH 'won' because his was the best, with a few adjustments. But it was fun. We laughed ourselves silly and once we had our actual finished plan and by that point were both a tad pissed we spent another hour doing a 'worst day ever' plan, where we sat people next to each other completely inappropriately - such as two very deaf relatives, or his 80 year old (vocal) misogynistic Grandfather next to a friend of mine who is a very active feminist. Was very entertaining imagining the outcome!
It will only be as stressful as you make it.