#1 dont seal the lid or stand on carpet without newspaper/binbag matting to protect the floor, a healthy yeast population can sprout an active 'kraussen' (big foamy yeast head), and when it happens it shows you have done lots of things right!!
Its unlikely to ocour but it can and does happen so being prepared is a Very good idea and planning for it in advance is wise. large garden centre gravel trays and old cat litter trays have been used to stand brewbuckets in
..
#2 dont trust the volume markings on a bucket (or any volume markings comer to that..) , think of them more as art work than measures you can rely on, get a sharpie and a 1l jug and regrade your bucket.. confirm a 1l jug measure as it should weigh 1 kg on good electric scales
you will need enough headroom in the bucket to accommodate you lumping if full from ground level to waist /counter top height for gravity draining.. and to accommodate a moderate Kraussen say 4-5" above the liquid level,
If however any yeasty foam does climb out of the bucket, give yourself a pat on the back for a job well done providing the yeast with a good environment and just wipe it up asap using just a clean damp cloth you have boiled first to sanitise, dont use any soaps or detergents, and keep the lid on and only once it has died down consider removing the lid and cleaning it and the bucket rim again with a preboiled to sanitise clean damp cloth.
you can also simply brew a kit a few litres short without any other changes it will result in a nominally stronger beer alcohol and flavour wise.
to maintain the same abv simply cut down on the sugar additions if any, you can google for calculators to help work out how much.
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