[Pap Pap considering Affinity over PS]

Good day all, I am a Pap Pap that is not "entirely" computer illiterate. I enjoy dabbling with making creations for the Grandchildren for Holidays and Birthdays. I tinkered, several years ago, with the Free Photo Shop and was somewhat successful. I wish to tinker further with literally, taking a .jpg picture of myself, wife etc. and putting it into a 5-10 second (existing) .gif. Example: Put my (.jpg) face on a (.gif) Puppy Dog walking up the sidewalk then sending it to one of our grandchildren for their Birthday. Gapeesh? Will Affinity do this? I would hate to purchase then be disappointed in the end. Is it more / less complex than what I tinkered with in PS several years ago? Thanks yall kindly....