Watermarks can be a pain to cover up.

　　I once tried to reason with a dear friend about the Catholic practice of praying to Mary rather than the scriptural admonition to go directly to God through Jesus Christ. There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. Galatians 3:28


Putting up a shelf should be a five-minute job, but saving time by not using a spirit level could cause all manner of problems later, when ornaments fall over or books slide off. Apply an oil-based primer paint or spray over the stain to seal it, and then you can cover it with any paint and colour you choose.
Lastly, whether it’s wood, wallpaper or carpet, check and double-check every measurement before making a cut - you can always take more off, but if you cut too short you have wasted your time, your material and, most importantly, your money.

Bespoke panelling around a bath and toilet give a bathroom a clean finish, but bear in mind that, inevitably, there will be the odd leak, and you will need access to the pipes to fix them.
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When putting up shelves and pictures on a partition wall, you must locate the weight-bearing studwork behind the plaster for support, or screws and nails will come out under the slightest weight. It’s easy to plan one removable panel or concealed door for this purpose, and this will give you a place to hide the spare toilet rolls and soap as well. These wooden posts, which are the backbone of the wall, may not always be where you want your nail to go, but in this case, you can always use cavity fixings, which anchor screws and nails into the plaster.