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The structure is fairly simple in practice. A subscription is set up around a delivery cadence, typically weekly or fortnightly, chosen to match how quickly a particular animal or collection gets through its livefood. Each delivery contains a set quantity of feeder insects, sized appropriately to the animal being fed, whether that's smaller insects for a juvenile or hatchling, or larger prey for an adult with a bigger appetite. The livefood itself is despatched to arrive live and in good condition, with appropriate packaging for the time of year and the journey involved.
Strictly speaking, a terrarium originally referred to a planted enclosure built around live vegetation, closer to a small indoor garden than a housing unit for an animal. A vivarium, by contrast, technically refers to any enclosure built to house a living creature, whether that's a reptile, amphibian or invertebrate, with or without live planting. In practice, though, UK retailers and keepers use both terms fairly loosely, often depending on regional habit or supplier naming rather than any strict definition.
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That said, there's a clear line between normal settling-in behaviour and something that needs attention. Prolonged refusal to eat beyond what's typical for the species, laboured breathing, unusual discharge, obvious injury, or any behaviour that seems more than ordinarily distressed are reasons to contact a vet experienced with reptiles straightaway, rather than waiting to see if it resolves on its own.
Northampton
Reptile Centre Northampton Centre's care sheets set out what normal settling-in behaviour looks like for species including the Hermann's tortoise, leopard gecko, corn snake and White's tree frog, which gives a new keeper a reasonable baseline to check against during those first uncertain days. Anything that falls outside that baseline is a matter for a vet, not a matter to manage alone.