Get the right answers to these questions:
Is this the right seat for my child?
The advisor should check that the seat is suitable for your child's weight and height.
Is the advisor well trained to help me?
Ask to see evidence, e.g. a certificate, to show they have been properly trained.
Is the seat of the correct standard?
The advisor should point out the official standard mark (ECE R44.04).
Are fitting instructions easily understood?
The advisor should go over them with you.
Is it a problem if my car has a frontal airbag?
The advisor should know that child restraints should not be fitted in a car with a frontal airbag, even if it is switched off.
Which make should I buy?
Try not to compromise. If the shop recommends the most appropriate restraint, even though it's more expensive, ignore your bargain-hunting instinct.