Most of the time, the difficulty of a language is evaluated by looking at one's native language.
If your target language is just distantly related to your native language then the target language is usually considered to be harder to learn.
For example, for a native English speaker, Welsh should be harder than Dutch because Dutch and English belong to the same branch(Germanic) of the Indo-European language family and are relatively closely related while it should be easier than say Japanese which doesn't to this language family at all.
Now, the orthography of Welsh is considered to be regular according to the website down belong. So, this actually should be the easiest part of learning the language. Still, I think that this part should be a bit easier to a native speaker of a language that corresponds more orthographically with Welsh.
So what's your native language OP?
https://en.wiktionary.org/wiki/Appendix:Welsh_pronunciation
>Fortunately, the pronunciation of Welsh words is regular and phonetic
>There are no silent letters. Every letter has a sound, and the sound is vocalized in spoken Welsh.