The ease of installation for external bifold doors can vary depending on a number of factors, such as the size and design of the door, the materials it is made from, and the experience and skill of the installer. In general, however, bifold doors are not considered to be difficult to install. Many bifold doors come with detailed instructions and pre-drilled holes for easy installation, and can be installed by a competent DIYer or a professional contractor.
If you are planning to install external bifold doors yourself, it is important to carefully read the instructions and gather all the necessary tools and materials before starting the project. You may also want to consult a professional to ensure that the installation is done correctly and safely. In some cases, it may be advisable to hire a professional to install the doors, especially if you are not confident in your ability to do the job or if the door is particularly large or complex.