| If you have a garden centre nearby that offers a lot of indoor plants and also pots up a lot of their plants for sale rather than simply buying them in for onsale then it's worth asking. You might also ask through your local garden club, if there is one, if there is someone who does topiary, or grows plants as standards eg fuchsia, lavender, lonicera. If you are going to do it yourself you need to do the braiding when the stems are still flexible. Not so young that they are juicy; not so old that they are brittle. And between waterings when the stems aren't so plump. When you have braided as far as the stems have firmed up then hold the braid together with a small strip of duct tape or grafting tape until the plant stems become fixed in place (probably 6 - 8 weeks). FWIW - sometimes braids are made from a single plant with multi-stems - and sometimes three or five seedlings are grouped together to make the braid. It is not unusual for a seedling to die at some stage and the stem gradually either dries out or rots away leaving a gap in the braid. This can be made a feature instead of being a flaw: the plant takes on the form of an open spiral. When you repot your plant you'll likely discover which system was used. If a five braid has been used it could be helpful to practice with thick yarn or thin rope before tackling the actual plant unless you are already familiar with braiding in the round. | 
