My usual technique is -
Decide the place looks tired.
Look up different designs online.
Look at different paint companies.
Start planning how to clear rooms, clean surfaces, fill and sand bits, think how lovely it'll look when it's all done and how my life will be so much better.
Look up different designs online.
Plan the whole process again.
Look at DP who would have to do the most physical parts, as he's sleeping sat upright on the sofa after work, vaguely reminding me of my Granddad in 1979.
Think about the changes in soft furnishings. Get distracted by the pictures of magnificent plants in giant, beautifully lit rooms and spend the next 3 hours looking at SM indoor gardens.
Remember the time I had to get paint off the cat, which I only discovered was an issue after following the trail of pawprints across the carpet in a completely different room. And the mess when another cat decided the larger plant on the shelf had to be destroyed.
Think 'Oh, it'll be different this time'.
Realise that this time, I'd need to do high ceilings and a shitload more gloss work as I didn't need to do either when I first moved in because they'd just been done.
Mentally allocate a period when I'm off work to do it.
Find out that DP is working that week. And every other week, as he's used up his leave.
Look up B&Q prices and stock levels.
Add everything to the basket that is actually in stock.
Look at the final price.
Think 'Oh, well, people never used to decorate this frequently, did they?'.
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