That’s definitely not something you should tackle yourself at all. Even if the tree is a manageable size, you have to be sure you know exactly what you are working with including the species. It’s generally illegal to cut down trees of any kind or size without council approval, and if you mistakenly take down a protected or native species, you’ll be facing hefty fines. Leave the removal to the experts who can help guide you through the process safely and compliantly.