The tools and help needed depend on the specific product and its instructions. Read the assembly information before ordering or ask for a copy if it is not available on the listing. Confirm which tools are included, whether any additional equipment is required and whether installation involves wall or ceiling fixings. Do not substitute unsuitable fasteners or guess a fixing method from another model. Larger pieces may be easier to assemble with another adult supporting parts while connections are made, but follow the stated process rather than improvising a sequence.
Clear enough floor space, keep small components away from pets and check the parts list before beginning. If structural mounting is involved and you are unsure about the surface or method, seek competent installation help. Plan the finished position in advance so you do not need to drag or twist a fully assembled heavy structure through a narrow room.
Before opening every packet, compare the parts list with the labelled components and identify the assembly sequence. Keeping fittings grouped by the instruction steps reduces the risk of using a similar-looking fastener in the wrong place.
For product comparisons alongside this advice, see Ultimate PawHouse and Taj-MeowHall. The details below explain their sizes and uses.
Further reading: giantpaws.co.uk.
Ultimate PawHouse
Taj-MeowHall
Cat-Cave