The model Let's Encrypt encourages is, when using shared or managed hosting, for your hosting provider to implement automated ACME software so that the only work you have to do -- if any -- is press a single button and your hosting company's software will automatically issue a certificate and then renew it in the future.
Many hosting companies support this.
Requiring you to manually obtain certificates is more complicated and error-prone for you, and means your website will break if you don't go through the same process to renew it every 2-3 months.
If you use a common control panel, like cPanel, it should have easy-to-use integrated certificate support (with Let's Encrypt or an alternative CA).