I downloaded a new iOS but I am finding it hard to install... pls what can be done

Make sure that your iPhone is setup to meet the following requirements before you attempt to update the iOS version over a Wi-Fi Network. Open Settings ➡️ General ➡️ Software Update: If there is an update available for your iPhone then it will be listed here. Follow the on-screen instructions to download and update your iPhone. 

• Your iPhone must have a fast Wi-Fi connection; you cannot update over cellular data or a cellular hotspot
• The iPhone can not be in Low Power mode
• The battery state of charge must be above 50%
• Your iPhone must have at least 6GB or more free storage space
• Your iPhone cannot be connected through VPN
• You should leave the phone plugged in until it finishes updating, both to assure that it remains above 50% and to keep Wi-Fi enabled (Wi-Fi turns off when the phone sleeps if not connected to power).

Axel F.

So you have the iOS downloaded?

Failed installs can involve insufficient free storage, or a corrupted install, or the use of an add-on VPN client, and the failure will usually display at least a diagnostic or two.

Any messages here?

Discontinue and remove any add-on VPN, and restart, and try again.

Try deleting the download, and re-download the update.

Failing that, use a Mac or Windows computer, and perform the update from there.

… Update your iPhone, iPad, or iPod touch - Apple Support

Failing that, back up, reset the iPhone to factory, and restore.

… Restore your iPhone, iPad, or iPod to factory settings - Apple Support